#include "bits/stdc++.h"
using namespace std;

#define rs ranges::
void solve() {
    int n;
    cin >> n;


    vector<string> ss(n);

    string t;

    for (auto &e: ss) cin >> e;
    cin >> t;

    string res;

    rs reverse(t);

    vector<int> p(n);
    vector<string> pos(t.size());
    for (int i = 0; i < n; ++i) {
        int x = ss[i].size() - 1;
        for (int j = 0; j < t.size(); ++j) {
            auto c = t[j];
            while (x >= 0 && ss[i][x] != c) {
                pos[j].push_back(ss[i][x]);
                --x;
            }
            if (x >= 0) {
                if (j + 1 == t.size()) {
                    cout << "NO\n";
                    return;
                }
                --x;
            } else {
                break;
            }
        }
    }
    for (int i = 0; i < t.size(); ++i) {
        res += pos[i];
        if (i + 1 != t.size()) res += t[i];
    }

    rs reverse(res);
    cout << "YES\n";
    cout << res << '\n';
}
signed main() {
    ios::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    int t = 1;
    //cin >> t;
    while (t--)
        solve();
}