#include <bits/stdc++.h>
using namespace std;
string s;
char x,y;
int main()
{
    while(1)
    {
        cin>>s>>x>>y;
        if(x=='0' && y=='0' && s=="0")return 0;
        else for(int i=0;i<s.size();i++)
        {
            if(s[i]==x)s[i]=y;
            if(s[i]=='0' && i==0)continue;
            cout<<s[i];
        }
        cout<<'\n';
    }
    return 0;
}