#include <iostream>
#include <string>

using namespace std;

int main()
{
    string sir;
    char c1, c2;

    while(1) {
        cin >> sir >> c1 >> c2;

        if (sir=="0" && c1=='0' && c2=='0')
            break;

        for (int i = 0; i < sir.size(); i++)
            if(sir[i]==c1)
            sir[i] = c2;

        int i = 0;
        for (i = 0; i < sir.size(); i++)
            if (sir[i]!='0')
                break;

        if (i == sir.size()) {
            cout << "0\n";
            continue;
        }
        for (;i < sir.size();i++)
            cout << sir[i];
        cout << '\n';
    }

    return 0;
}