static String maxValue ( char [ ] a , char [ ] b ) {
  Arrays . sort ( b ) ;
  int n = a . length ;
  int m = b . length ;
  int j = m - 1 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( j < 0 ) break ;
    if ( b [ j ] > a [ i ] ) {
      a [ i ] = b [ j ] ;
      j -- ;
    }
  }
  return String . valueOf ( a ) ;
}

static String maxValue ( char [ ] a , char [ ] b ) { Arrays . sort ( b ) ; int n = a . length ; int m = b . length ; int j = m - 1 ; for ( int i = 0 ; i < n ; i ++ ) { if ( j < 0 ) break ; if ( b [ j ] > a [ i ] ) { a [ i ] = b [ j ] ; j -- ; } } return String . valueOf ( a ) ; }
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