public static void main ( String [ ] args ) {
  FastReader entrada = new FastReader ( ) ;
  int larg = entrada . nextInt ( ) ;
  int rad = entrada . nextInt ( ) ;
  int fork = 0 ;
  for ( int i = larg ;
  i <= rad ;
  i ++ ) {
    int numero = i ;
    boolean visitou [ ] = new boolean [ 100 ] ;
    while ( numero != 0 ) {
      if ( visitou [ numero % 10 ] ) break ;
      visitou [ numero % 10 ] = true ;
      numero = numero / 10 ;
    }
    if ( numero == 0 ) {
      fork = 1 ;
      System . out . print ( i ) ;
      break ;
    }
  }
  if ( fork == 0 ) {
    System . out . println ( - 1 ) ;
  }
}

public static void main ( String [ ] args ) { FastReader entrada = new FastReader ( ) ; int larg = entrada . nextInt ( ) ; int rad = entrada . nextInt ( ) ; int fork = 0 ; for ( int i = larg ; i <= rad ; i ++ ) { int numero = i ; boolean visitou [ ] = new boolean [ 100 ] ; while ( numero != 0 ) { if ( visitou [ numero % 10 ] ) break ; visitou [ numero % 10 ] = true ; numero = numero / 10 ; } if ( numero == 0 ) { fork = 1 ; System . out . print ( i ) ; break ; } } if ( fork == 0 ) { System . out . println ( - 1 ) ; } }
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