#include <iostream>
using namespace std;

int main() {
    int n;
    string s;
    char s1,s2,s3,s4;
    cin >> n >> s1 >>s2 >>s3 >> s4 >> s;
    for(int i = 0;i<n;++i){
        if(s[i]==s1){
            s[i]=s2;
        }
        if(s[i]==s3){
            s[i]=s4;
        }
    }
    cout << s;
}