public static void main ( String [ ] args ) {
  Scanner in = new Scanner ( System . in ) ;
  int type = in . nextInt ( ) ;
  String input = in . next ( ) ;
  int hStart ;
  int hEnd ;
  if ( type == 12 ) {
    hStart = 1 ;
    hEnd = 12 ;
  }
  else {
    hStart = 0 ;
    hEnd = 23 ;
  }
  int minDiff = 5 ;
  String answer = null ;
  for ( int h = hStart ;
  h <= hEnd ;
  h ++ ) {
    for ( int m = 0 ;
    m <= 59 ;
    m ++ ) {
      String S = String . format ( "%02d:%02d" , h , m ) ;
      int diff = 0 ;
      for ( int i = 0 ;
      i < 5 ;
      i ++ ) {
        if ( input . charAt ( i ) != S . charAt ( i ) ) {
          diff ++ ;
        }
      }
      if ( diff < minDiff ) {
        minDiff = diff ;
        answer = S ;
      }
    }
  }
  System . out . println ( answer ) ;
}

public static void main ( String [ ] args ) { Scanner in = new Scanner ( System . in ) ; int type = in . nextInt ( ) ; String input = in . next ( ) ; int hStart ; int hEnd ; if ( type == 12 ) { hStart = 1 ; hEnd = 12 ; } else { hStart = 0 ; hEnd = 23 ; } int minDiff = 5 ; String answer = null ; for ( int h = hStart ; h <= hEnd ; h ++ ) { for ( int m = 0 ; m <= 59 ; m ++ ) { String S = String . format ( " % 02d : %02d " , h , m ) ; int diff = 0 ; for ( int i = 0 ; i < 5 ; i ++ ) { if ( input . charAt ( i ) != S . charAt ( i ) ) { diff ++ ; } } if ( diff < minDiff ) { minDiff = diff ; answer = S ; } } } System . out . println ( answer ) ; }
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