#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    ll n;
    string s;
    cin >> n >> s;
    bool check = false;
    string ans = "";
    for (int i = 0; i < n; i++) {
        string x = "";
        for (int j = 0; j < n; j++) {
            if (j != i) {
                x += s[j];
            }
        }
        if (x.substr(0, (n - 1) / 2) == x.substr((n - 1) / 2)) {
            if (check) {
                cout << "NOT UNIQUE\n";
                return 0;
            }
            check = true;
            ans = x.substr(0, (n - 1) / 2);
        }
    }
    if (check) {
        cout << ans << "\n";
    } else {
        cout << "NOT POSSIBLE\n";
    }
    return 0;
}
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