#ifdef LOCAL
#include "precompiled_headers.h"
#else
#include <bits/stdc++.h>
#endif

using namespace std;

string mul_k(string s, int k) {
    string res;
    for (int i=1; i<=k; i++) {
        res += s;
    }
    return res;
}

int main() {
    std::ios::sync_with_stdio(0);
    cin.tie(0);
#ifdef LOCAL
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif
    int n;
    cin >> n;

    for (int i=1; i<=n; i++) {
        string s;
        cin >> s;

        int max_val = 0;
        int max_start, max_len;
        for (int i=0; i<s.length(); i++) {
            for (int j=0; j<s.length(); j++) {
                if (i != j && s[i] == s[j]) {
                    int start_i = i;
                    int start_j = j;
                    int curr_i = start_i;
                    int curr_j = start_j;
                    while (curr_i < start_j && curr_i < s.length() && curr_j < s.length() && s[curr_i] == s[curr_j]) {
                        curr_i++;
                        curr_j++;
                    }
                    if (curr_i - start_i > max_val) {
                        max_val = curr_i - start_i;
                        max_start = start_i;
                        max_len = max_val;
                    }
                }

            }
        }
        string ss;
        for (int i=0; i<max_val; i++) {
            ss += s[max_start + i];
        }

        cout << ss << '\n';
    }
}