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/* http://www.hsin.hr/skolska2007/zadaci/pas_c_cpp/prva/zadaci.pdf */
#include <iostream>
using namespace std;
main()
{
      string s, b;
      cin >> s;
      cin >> b;

      int j = 0;
      for (int i=0; i<s.length(); i++)
      if (s[i] == 'x')
         {
               s[i] = b[j];
               j++;
         }

      cout << s << endl;

      system ("PAUSE");
}