#include <iostream>
#include <string>
using namespace std;

string s;
char c1, c2;

int main(){
	int i;

	cin >> s >> c1 >> c2;

	while (s[0] != '0' || c1 != '0' || c2 != '0'){
		for ( i = 0; i < s.size(); i++){
			if (s[i] == c1) s[i] = c2;
		}

		cout << s << '\n';

		cin >> s >> c1 >> c2;
	}

	return 0;
}