public static void main ( String [ ] args ) {
  Scanner scanner = new Scanner ( System . in ) ;
  String s = scanner . nextLine ( ) ;
  String [ ] split = s . split ( ":" ) ;
  int a = Integer . valueOf ( split [ 0 ] ) ;
  int b = Integer . valueOf ( split [ 1 ] ) ;
  while ( true ) {
    b ++ ;
    a += ( b / 60 ) ;
    b %= 60 ;
    a %= 24 ;
    if ( b / 10 == a % 10 && b % 10 == a / 10 ) {
      break ;
    }
  }
  System . out . println ( a / 10 + "" + a % 10 + ":" + b / 10 + b % 10 ) ;
}

public static void main ( String [ ] args ) { Scanner scanner = new Scanner ( System . in ) ; String s = scanner . nextLine ( ) ; String [ ] split = s . split ( " : " ) ; int a = Integer . valueOf ( split [ 0 ] ) ; int b = Integer . valueOf ( split [ 1 ] ) ; while ( true ) { b ++ ; a += ( b / 60 ) ; b %= 60 ; a %= 24 ; if ( b / 10 == a % 10 && b % 10 == a / 10 ) { break ; } } System . out . println ( a / 10 + " " + a % 10 + " : " + b / 10 + b % 10 ) ; }
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