public static void main ( String [ ] args ) {
  Scanner in = new Scanner ( System . in ) ;
  String s = in . next ( ) ;
  if ( s . lastIndexOf ( '@' ) == s . length ( ) - 1 || s . indexOf ( '@' ) == 0 || ! s . contains ( "@" ) ) {
    System . out . println ( "No solution" ) ;
    System . exit ( 0 ) ;
  }
  Vector < Integer > v = new Vector < > ( ) ;
  for ( int i = 0 ;
  i < s . length ( ) ;
  i ++ ) {
    if ( s . charAt ( i ) == '@' ) {
      v . add ( i ) ;
    }
  }
  if ( v . size ( ) == 1 ) {
    System . out . println ( s ) ;
  }
  else {
    for ( int i = 1 ;
    i < v . size ( ) ;
    i ++ ) {
      if ( v . get ( i ) - v . get ( i - 1 ) <= 2 ) {
        System . out . println ( "No solution" ) ;
        System . exit ( 0 ) ;
      }
    }
    String result = "" ;
    Vector < String > vec = new Vector < > ( ) ;
    for ( int i = 0 ;
    i < s . length ( ) ;
    i ++ ) {
      result += s . charAt ( i ) ;
      if ( s . charAt ( i ) == '@' ) {
        result += s . charAt ( i + 1 ) ;
        vec . add ( result ) ;
        result = "" ;
        i ++ ;
      }
    }
    String az = s . substring ( v . get ( v . size ( ) - 1 ) + 2 ) ;
    for ( int i = 0 ;
    i < vec . size ( ) - 1 ;
    i ++ ) {
      System . out . print ( vec . get ( i ) + "," ) ;
    }
    System . out . print ( vec . get ( vec . size ( ) - 1 ) + "" + az ) ;
  }
}

public static void main ( String [ ] args ) { Scanner in = new Scanner ( System . in ) ; String s = in . next ( ) ; if ( s . lastIndexOf ( ' @ ' ) == s . length ( ) - 1 || s . indexOf ( ' @ ' ) == 0 || ! s . contains ( " @ " ) ) { System . out . println ( " No ▁ solution " ) ; System . exit ( 0 ) ; } Vector < Integer > v = new Vector < > ( ) ; for ( int i = 0 ; i < s . length ( ) ; i ++ ) { if ( s . charAt ( i ) == ' @ ' ) { v . add ( i ) ; } } if ( v . size ( ) == 1 ) { System . out . println ( s ) ; } else { for ( int i = 1 ; i < v . size ( ) ; i ++ ) { if ( v . get ( i ) - v . get ( i - 1 ) <= 2 ) { System . out . println ( " No ▁ solution " ) ; System . exit ( 0 ) ; } } String result = " " ; Vector < String > vec = new Vector < > ( ) ; for ( int i = 0 ; i < s . length ( ) ; i ++ ) { result += s . charAt ( i ) ; if ( s . charAt ( i ) == ' @ ' ) { result += s . charAt ( i + 1 ) ; vec . add ( result ) ; result = " " ; i ++ ; } } String az = s . substring ( v . get ( v . size ( ) - 1 ) + 2 ) ; for ( int i = 0 ; i < vec . size ( ) - 1 ; i ++ ) { System . out . print ( vec . get ( i ) + " , " ) ; } System . out . print ( vec . get ( vec . size ( ) - 1 ) + " " + az ) ; } }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))) (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (character_literal))) right: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (decimal_integer_literal))) right: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (character_literal))) right: (decimal_integer_literal))) right: (unary_expression operand: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (string_literal)))))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal)))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (decimal_integer_literal)))))) (local_variable_declaration type: (generic_type (type_identifier) (type_arguments (type_identifier))) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (generic_type (type_identifier) (type_arguments)) arguments: (argument_list)))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (character_literal))) consequence: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))))))) (if_statement condition: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (decimal_integer_literal))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))) alternative: (block (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (decimal_integer_literal))))) right: (decimal_integer_literal))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal)))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (decimal_integer_literal)))))))) (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (string_literal))) (local_variable_declaration type: (generic_type (type_identifier) (type_arguments (type_identifier))) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (generic_type (type_identifier) (type_arguments)) arguments: (argument_list)))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))) (if_statement condition: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (character_literal))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (decimal_integer_literal)))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))) (expression_statement (assignment_expression left: (identifier) right: (string_literal))) (expression_statement (update_expression (identifier))))))) (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (decimal_integer_literal)))) right: (decimal_integer_literal)))))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (decimal_integer_literal))) update: (update_expression (identifier)) body: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (string_literal))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (decimal_integer_literal)))) right: (string_literal)) right: (identifier)))))))))