# include <iostream>
using namespace std;

int n, c1, c2;
int main() {
    cin >> n >> c1 >> c2;
    int inv = 0;
    int in = 0;
    if(n == 0) {
        cout << c2;
        return 0;
    }
    while(n) {
        in = in * 10 + n % 10;
        n /= 10;
    }
    while(in) {
        int c = in % 10;
        if (c == c1) {
            inv = inv * 10 + c2;
        } else {
            inv = inv * 10 + c;
        }
        in /= 10;
    }
    cout << inv;
}