#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>

using namespace std;

char s[8], c1, c2;
int main()
{
    scanf("%s %c %c", s, &c1, &c2);
    while(s[0] != '0' || c1 != '0' || c2 != '0') {
        int l = strlen(s), i;
        for(i = 0; i < l; i++)
            if(s[i] == c1)
                s[i] = c2;
        i = 0;
        while(s[i] == '0' && strlen(s) > 1) {
            strcpy(s, s+1);
            s[strlen(s)] = 0;
        }
        printf("%s\n", s);
        scanf("%s %c %c", s, &c1, &c2);
    }
    return 0;
}