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

int main()
{
    int i;
    char s[20];
    char c1,c2,aux;
    while (cin)
    {
        cin>>s;
        cin>>c1>>c2;

        if(c1=='0' && c2=='0' && s[0]=='0') return 0;

        for(i=0;i<strlen(s);i++)
        {
            if(s[i]==c1) s[i]=c2;
        }
        i=0;
        while(s[i]=='0') i++;

        cout<<s+i<<'\n';
    }
    return 0;
}