#include <iostream>
#include <limits.h>
#include <cmath>
#include <string>
#include <stdio.h>
#include <algorithm>
#include <stdlib.h>
#include <vector>
#include <stack>
#include <map>
#include <fstream>

using namespace std;

//ifstream f("nr.in");
//#define cin f

int i;
string a;
char b,c;

int main()
{
    for( ; ; )
    {
        cin>>a>>b>>c;
        if (a[0] == '0' and b == '0' and c == '0' and a.size() == 1)
                return 0;

        for(i=0; i<a.size(); i++)
            if (a[i] == b)
                    a[i] = c;

        int zero = 0;
        for(i=0; i<a.size(); i++)
            if (a[i] == '0') zero ++;

        if (zero == a.size())
            cout<<0;
        else
        for(i=0; i<a.size(); i++)
        {
            if (i==0 and a[i] != '0')
                cout<<a[i];
            if (i > 0)
                cout<<a[i];
        }

        cout<<endl;
    }

	return 0;
}