public static void main ( String [ ] args ) throws IOException {
  String s = input . nextLine ( ) ;
  String [ ] str = s . split ( ":" ) ;
  int n = Integer . parseInt ( str [ 0 ] ) ;
  int m = Integer . parseInt ( str [ 1 ] ) ;
  while ( true ) {
    m ++ ;
    n += m / 60 ;
    m = m % 60 ;
    n = n % 24 ;
    if ( n / 10 == m % 10 && n % 10 == m / 10 ) {
      break ;
    }
  }
  pr . printf ( "%d%d:%d%d" , n / 10 , n % 10 , m / 10 , m % 10 ) ;
  pr . flush ( ) ;
}

public static void main ( String [ ] args ) throws IOException { String s = input . nextLine ( ) ; String [ ] str = s . split ( " : " ) ; int n = Integer . parseInt ( str [ 0 ] ) ; int m = Integer . parseInt ( str [ 1 ] ) ; while ( true ) { m ++ ; n += m / 60 ; m = m % 60 ; n = n % 24 ; if ( n / 10 == m % 10 && n % 10 == m / 10 ) { break ; } } pr . printf ( " % d % d : % d % d " , n / 10 , n % 10 , m / 10 , m % 10 ) ; pr . flush ( ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) (throws (type_identifier)) body: (block (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: (array_type element: (type_identifier) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (string_literal))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (decimal_integer_literal)))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (decimal_integer_literal)))))) (while_statement condition: (parenthesized_expression (true)) body: (block (expression_statement (update_expression (identifier))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (binary_expression left: (identifier) right: (decimal_integer_literal))))) consequence: (block (break_statement))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (string_literal) (binary_expression left: (identifier) right: (decimal_integer_literal)) (binary_expression left: (identifier) right: (decimal_integer_literal)) (binary_expression left: (identifier) right: (decimal_integer_literal)) (binary_expression left: (identifier) right: (decimal_integer_literal))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))