#include <bits/stdc++.h>


#include <algorithm>
#include <cassert>
#include <vector>

template <class T>
bool chmax(T &a, const T &b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}

template <class T>
bool chmin(T &a, const T &b) {
    if (a > b) {
        a = b;
        return true;
    }
    return false;
}

template <class T>
T div_floor(T a, T b) {
    if (b < 0) a *= -1, b *= -1;
    return a >= 0 ? a / b : (a + 1) / b - 1;
}

template <class T>
T div_ceil(T a, T b) {
    if (b < 0) a *= -1, b *= -1;
    return a > 0 ? (a - 1) / b + 1 : a / b;
}

template <typename T>
struct CoordComp {
    std::vector<T> v;
    bool sorted;

    CoordComp() : sorted(false) {}

    int size() { return v.size(); }

    void add(T x) { v.push_back(x); }

    void build() {
        std::sort(v.begin(), v.end());

        v.erase(std::unique(v.begin(), v.end()), v.end());
        sorted = true;
    }

    int get_idx(T x) {
        assert(sorted);
        return lower_bound(v.begin(), v.end(), x) - v.begin();
    }

    T &operator[](int i) { return v[i]; }
};


#define For(i, a, b) for (int i = (int)(a); (i) < (int)(b); ++(i))
#define rFor(i, a, b) for (int i = (int)(a)-1; (i) >= (int)(b); --(i))
#define rep(i, n) For(i, 0, n)
#define rrep(i, n) rFor(i, n, 0)
#define fi first
#define se second

using namespace std;

using lint = long long;
using pii = pair<int, int>;
using pll = pair<lint, lint>;

string s = "inabameguru";
bool used[20];
int n;
set<string> S;

bool is_vowel(char c) {
    return (c == 'a' || c == 'i' || c == 'u' || c == 'e' || c == 'o');
}

bool dfs(string &t) {
    if (t.size() == s.size()) {
        if (S.find(t) != S.end()) return false;
        if (!is_vowel(t.back())) return false;
        cout << t << "\n";
        return true;
    }
    rep(i, s.size()) if (!used[i]) {
        if (!t.empty() && !is_vowel(t.back()) && !is_vowel(s[i])) continue;
        t += s[i];
        used[i] = true;
        if (dfs(t)) return true;
        t.pop_back();
        used[i] = false;
    }
    return false;
}

int main() {
    scanf("%d", &n);
    rep(i, n) {
        string s;
        cin >> s;
        S.insert(s);
    }
    string t = "";
    if (!dfs(t)) puts("NO");
}