#include <bits/stdc++.h>

using namespace std;

int main() {
    int n;
    cin >> n;

    vector<string> yes(n);
    string no;

    for (int i = 0; i < n; i++) {
        cin >> yes[i];
    }

    cin >> no;

    vector<string> res(no.size());

    for (string y: yes) {
        int i = 0;
        for (char c: y) {
            if (no[i] == c) {
                i++;
            } else {
                res[i].push_back(c);
            }
            if (i == no.size()) goto nein;
        }
    }

    cout << "YES" << endl;
    for (int i = 0; i < no.size(); i++)
    {
        cout << res[i];
        if (i != no.size() - 1) cout << no[i];
    }
    cout << endl;
    return 0;

    nein:
    cout << "NO" << endl;
}