private static void main2 ( ) throws IOException {
  char [ ] c = in . next ( ) . toCharArray ( ) ;
  int n = c . length ;
  char [ ] stack = new char [ n ] ;
  int idx = 0 ;
  int need = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( idx > 0 && stack [ idx - 1 ] == c [ i ] ) {
      idx -- ;
      continue ;
    }
    if ( i + idx >= n ) {
      need ++ ;
      idx -- ;
    }
    else {
      stack [ idx ++ ] = c [ i ] ;
    }
  }
  out . println ( ( n - need ) * 5 ) ;
}

private static void main2 ( ) throws IOException { char [ ] c = in . next ( ) . toCharArray ( ) ; int n = c . length ; char [ ] stack = new char [ n ] ; int idx = 0 ; int need = 0 ; for ( int i = 0 ; i < n ; i ++ ) { if ( idx > 0 && stack [ idx - 1 ] == c [ i ] ) { idx -- ; continue ; } if ( i + idx >= n ) { need ++ ; idx -- ; } else { stack [ idx ++ ] = c [ i ] ; } } out . println ( ( n - need ) * 5 ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters) (throws (type_identifier)) body: (block (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (field_access object: (identifier) field: (identifier)))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (identifier))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (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: (identifier)) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (binary_expression left: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (array_access array: (identifier) index: (identifier))))) consequence: (block (expression_statement (update_expression (identifier))) (continue_statement))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (identifier))) consequence: (block (expression_statement (update_expression (identifier))) (expression_statement (update_expression (identifier)))) alternative: (block (expression_statement (assignment_expression left: (array_access array: (identifier) index: (update_expression (identifier))) right: (array_access array: (identifier) index: (identifier)))))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) right: (decimal_integer_literal)))))))