#include <bits/stdc++.h>

using namespace std;

#define int long long

void solve() {
  string s; cin >> s;
  int n = (int)s.size();
  string res = "";
  auto chk = [&](string t, int len) {
    int cnt = 0;
    for (int i = 0; i <= n - len; i++) {
      if (s[i] == t[0]) {
        int flag = 1;
        for (int j = 0; j < len; j++) {
          if (s[i + j] != t[j]) {
            flag = 0;
            break;
          }
        }
        if (flag) {
          i += len - 1;
          cnt++;
        }
      }
    }
    return cnt >= 2;
  };
  for (int l = 0; l < n; l++) {
    for (int r = l; r < n; r++) {
      if (r - l + 1 > n / 2) continue;
      if (chk(s.substr(l, r - l + 1), r - l + 1)) {
        if (r - l + 1 > (int)res.size()) {
          res = s.substr(l, r - l + 1);
        }
      }
    }
  }
  cout << res << "\n";
}

signed main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  int T = 1;
  cin >> T;
  while (T--) solve();
}