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

int main()
{
    char n[100000], c1, c2;

    while(1)
    {
            if ( strcmp(n, "0") == 0 && c1 == '0' && c2 == '0')
                break;
            else
            {
                cin>>n>>c1>>c2;
            for(int i = 0; i <strlen(n); i++)
                {
                    if(n[i] == c1)
                        cout<<c2;
                    else
                        cout<<n[i];
                }
            cout<<'\n';

            }

    }


return 0;
}