public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  String S = sc . nextLine ( ) ;
  StringBuilder sd = new StringBuilder ( "" ) ;
  for ( int i = 0 ;
  i < S . length ( ) ;
  i ++ ) {
    if ( S . charAt ( i ) >= 'a' && S . charAt ( i ) <= 'z' ) sd . append ( S . charAt ( i ) ) ;
    else if ( S . charAt ( i ) == ' ' ) {
      for ( ;
      S . charAt ( i ) == ' ' ;
      i ++ ) {
      }
      if ( S . charAt ( i ) >= 'a' && S . charAt ( i ) <= 'z' ) {
        sd . append ( ' ' ) ;
        sd . append ( S . charAt ( i ) ) ;
      }
      else {
        sd . append ( S . charAt ( i ) ) ;
        if ( S . charAt ( i + 1 ) != ' ' ) sd . append ( ' ' ) ;
      }
    }
    else if ( S . charAt ( i ) == '.' || S . charAt ( i ) == ',' || S . charAt ( i ) == '!' || S . charAt ( i ) == '?' ) {
      sd . append ( S . charAt ( i ) ) ;
      if ( S . charAt ( i + 1 ) != ' ' ) sd . append ( ' ' ) ;
    }
  }
  System . out . println ( sd ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; String S = sc . nextLine ( ) ; StringBuilder sd = new StringBuilder ( " " ) ; for ( int i = 0 ; i < S . length ( ) ; i ++ ) { if ( S . charAt ( i ) >= ' a ' && S . charAt ( i ) <= ' z ' ) sd . append ( S . charAt ( i ) ) ; else if ( S . charAt ( i ) == ' ▁ ' ) { for ( ; S . charAt ( i ) == ' ▁ ' ; i ++ ) { } if ( S . charAt ( i ) >= ' a ' && S . charAt ( i ) <= ' z ' ) { sd . append ( ' ▁ ' ) ; sd . append ( S . charAt ( i ) ) ; } else { sd . append ( S . charAt ( i ) ) ; if ( S . charAt ( i + 1 ) != ' ▁ ' ) sd . append ( ' ▁ ' ) ; } } else if ( S . charAt ( i ) == ' . ' || S . charAt ( i ) == ' , ' || S . charAt ( i ) == ' ! ' || S . charAt ( i ) == ' ? ' ) { sd . append ( S . charAt ( i ) ) ; if ( S . charAt ( i + 1 ) != ' ▁ ' ) sd . append ( ' ▁ ' ) ; } } System . out . println ( sd ) ; }
(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)))) (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (string_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: (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: (character_literal)) right: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (character_literal)))) consequence: (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))))) alternative: (if_statement condition: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (character_literal))) consequence: (block (for_statement condition: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (character_literal)) 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: (character_literal)) right: (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 (character_literal)))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))))) alternative: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (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 (binary_expression left: (identifier) right: (decimal_integer_literal)))) right: (character_literal))) consequence: (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (character_literal)))))))) alternative: (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (binary_expression left: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (character_literal)) right: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (character_literal))) right: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (character_literal))) right: (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 (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 (binary_expression left: (identifier) right: (decimal_integer_literal)))) right: (character_literal))) consequence: (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (character_literal))))))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))