public static void main ( String [ ] args ) {
  Scanner in = new Scanner ( System . in ) ;
  char [ ] A = in . next ( ) . toCharArray ( ) ;
  int [ ] stat = new int [ 10 ] ;
  for ( char c : in . next ( ) . toCharArray ( ) ) {
    stat [ c - '0' ] ++ ;
  }
  stat [ 0 ] ++ ;
  char replacement = '9' ;
  int idx = 0 ;
  while ( idx < A . length ) {
    while ( stat [ replacement - '0' ] == 0 ) replacement -- ;
    if ( A [ idx ] < replacement ) {
      A [ idx ] = replacement ;
      stat [ replacement - '0' ] -- ;
    }
    idx ++ ;
  }
  System . out . println ( new String ( A ) ) ;
}

public static void main ( String [ ] args ) { Scanner in = new Scanner ( System . in ) ; char [ ] A = in . next ( ) . toCharArray ( ) ; int [ ] stat = new int [ 10 ] ; for ( char c : in . next ( ) . toCharArray ( ) ) { stat [ c - '0' ] ++ ; } stat [ 0 ] ++ ; char replacement = '9' ; int idx = 0 ; while ( idx < A . length ) { while ( stat [ replacement - '0' ] == 0 ) replacement -- ; if ( A [ idx ] < replacement ) { A [ idx ] = replacement ; stat [ replacement - '0' ] -- ; } idx ++ ; } System . out . println ( new String ( A ) ) ; }
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