public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  String s = sc . next ( ) ;
  int count = 0 ;
  for ( int i = 0 ;
  i < s . length ( ) / 2 ;
  i ++ ) {
    if ( s . charAt ( i ) != s . charAt ( s . length ( ) - 1 - i ) ) {
      count ++ ;
    }
  }
  int sum = 0 ;
  if ( count == 0 ) {
    if ( s . length ( ) == 1 ) {
      sum = 0 ;
    }
    else if ( s . length ( ) % 2 == 1 ) {
      sum = 25 * ( s . length ( ) - 1 ) ;
    }
    else {
      sum = 25 * s . length ( ) ;
    }
  }
  else if ( count == 1 ) {
    sum = 25 * s . length ( ) - 2 ;
  }
  else {
    sum = 25 * s . length ( ) ;
  }
  System . out . println ( sum ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; String s = sc . next ( ) ; int count = 0 ; for ( int i = 0 ; i < s . length ( ) / 2 ; i ++ ) { if ( s . charAt ( i ) != s . charAt ( s . length ( ) - 1 - i ) ) { count ++ ; } } int sum = 0 ; if ( count == 0 ) { if ( s . length ( ) == 1 ) { sum = 0 ; } else if ( s . length ( ) % 2 == 1 ) { sum = 25 * ( s . length ( ) - 1 ) ; } else { sum = 25 * s . length ( ) ; } } else if ( count == 1 ) { sum = 25 * s . length ( ) - 2 ; } else { sum = 25 * s . length ( ) ; } System . out . println ( sum ) ; }
(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: (integral_type) declarator: (variable_declarator name: (identifier) value: (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 (if_statement condition: (parenthesized_expression (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: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (decimal_integer_literal)) right: (identifier)))))) consequence: (block (expression_statement (update_expression (identifier))))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (block (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 (assignment_expression left: (identifier) right: (decimal_integer_literal)))) alternative: (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (decimal_integer_literal)) right: (decimal_integer_literal))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (decimal_integer_literal) right: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (decimal_integer_literal))))))) alternative: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (decimal_integer_literal) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))))))))) alternative: (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (binary_expression left: (decimal_integer_literal) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) right: (decimal_integer_literal))))) alternative: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (decimal_integer_literal) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))