#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

#define fi first
#define se second
#define fastIO ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);

const int N = (int)2e5 + 10;
const int AL = 26;
int pi[N];
set<int> M[AL];
string s[N];

int main(){
    fastIO;
    int n;
    cin >> n;
    for(int i = 1; i <= n; i ++ ){
        cin >> s[i];
        M[s[i][0] - 'a'].insert(i);
    }
    string t;
    cin >> t;
    string res;
    int m = t.size();
    for(int i = 0 ; i < m ; i ++ ){
        for(int j = 0 ; j < AL; j ++ ){
            if(t[i] - 'a' != j){
                auto it = M[j].begin();
                vector<int> re;
                while(it != M[j].end()){
                    int x = *it;
                    re.push_back(x);
                    it = M[j].erase(it);
                    while(pi[x] < s[x].size() && s[x][pi[x]] != t[i]){
                        res.push_back(s[x][pi[x]]);
                        pi[x] ++ ;
                    }
                }
                for(auto x : re){
                    if(pi[x] < s[x].size()){
                        M[s[x][pi[x]] - 'a'].insert(x);
                    }
                }
            }
        }
        int v = t[i] - 'a';
        if(!M[v].empty()){
            res.push_back(char('a' + v));
            vector<int> re;
            auto it = M[v].begin();
            while(it != M[v].end()){
                int x = *it;
                re.push_back(x);
                it = M[v].erase(it);
                pi[x] ++ ;
            }
            for(auto x : re){
                if(pi[x] < s[x].size()){
                    M[s[x][pi[x]] - 'a'].insert(x);
                }
            }
        }
    }
    for(int i = 0 ; i < n; i ++ ){
        if(pi[i] < s[i].size()){
            cout << "NO\n";
            return 0;
        }
    }
    int w = 0;
    for(int i = 0 ; i < res.size(); i ++ ){
        if(w < t.size() && res[i] == t[w]){
            w ++ ;
        }
    }
    if(w == t.size()){
        cout << "NO\n";
        return 0;
    }
    cout << "YES\n" << res << "\n";
    return 0;   
}