public static void main ( String args [ ] ) {
  input ( ) ;
  int N = s . length ( ) ;
  int count = 0 ;
  for ( int i = 0 ;
  i < N / 2 ;
  i ++ ) {
    if ( s . charAt ( i ) != s . charAt ( N - i - 1 ) ) count ++ ;
  }
  int ans = 0 ;
  if ( count == 0 ) {
    if ( N % 2 == 1 ) {
      ans = 25 * N - 25 ;
    }
    else {
      ans = 25 * N ;
    }
  }
  else if ( count == 1 ) {
    ans = 25 * N - 2 ;
  }
  else if ( count >= 2 ) {
    ans = 25 * N ;
  }
  System . out . println ( ans ) ;
}

public static void main ( String args [ ] ) { input ( ) ; int N = s . length ( ) ; int count = 0 ; for ( int i = 0 ; i < N / 2 ; i ++ ) { if ( s . charAt ( i ) != s . charAt ( N - i - 1 ) ) count ++ ; } int ans = 0 ; if ( count == 0 ) { if ( N % 2 == 1 ) { ans = 25 * N - 25 ; } else { ans = 25 * N ; } } else if ( count == 1 ) { ans = 25 * N - 2 ; } else if ( count >= 2 ) { ans = 25 * N ; } System . out . println ( ans ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (type_identifier) name: (identifier) dimensions: (dimensions))) body: (block (expression_statement (method_invocation name: (identifier) arguments: (argument_list))) (local_variable_declaration type: (integral_type) 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: (identifier) 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: (identifier) right: (identifier)) right: (decimal_integer_literal)))))) consequence: (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: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (decimal_integer_literal))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (binary_expression left: (decimal_integer_literal) right: (identifier)) right: (decimal_integer_literal))))) alternative: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (decimal_integer_literal) right: (identifier))))))) 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: (identifier)) right: (decimal_integer_literal))))) 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: (decimal_integer_literal) right: (identifier)))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))