public static void main ( String [ ] args ) {
  Scanner scan = new Scanner ( System . in ) ;
  int n , m , i , j ;
  String a , s ;
  char [ ] ch = new char [ 100000 ] ;
  a = scan . next ( ) ;
  s = scan . next ( ) ;
  n = a . length ( ) ;
  m = s . length ( ) ;
  ch = s . toCharArray ( ) ;
  Arrays . sort ( ch , 0 , m ) ;
  s = String . valueOf ( ch ) ;
  char [ ] A = a . toCharArray ( ) ;
  j = m - 1 ;
  for ( i = 0 ;
  i < n && j >= 0 ;
  ++ i ) if ( A [ i ] < s . charAt ( j ) ) {
    A [ i ] = s . charAt ( j ) ;
    j -- ;
  }
  a = String . valueOf ( A ) ;
  System . out . println ( a ) ;
}

public static void main ( String [ ] args ) { Scanner scan = new Scanner ( System . in ) ; int n , m , i , j ; String a , s ; char [ ] ch = new char [ 100000 ] ; a = scan . next ( ) ; s = scan . next ( ) ; n = a . length ( ) ; m = s . length ( ) ; ch = s . toCharArray ( ) ; Arrays . sort ( ch , 0 , m ) ; s = String . valueOf ( ch ) ; char [ ] A = a . toCharArray ( ) ; j = m - 1 ; for ( i = 0 ; i < n && j >= 0 ; ++ i ) if ( A [ i ] < s . charAt ( j ) ) { A [ i ] = s . charAt ( j ) ; j -- ; } a = String . valueOf ( A ) ; System . out . println ( a ) ; }
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