#include <bits/stdc++.h>
using namespace std;
using ll = long long;

#ifdef LOCAL
#include <debug.hpp>
#else
#define debug(...)
#endif

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(20);
    int T;
    cin >> T;

    vector<int> sq;
    vector<vector<int>> cnt;
    for (int i = 1; i * i <= 1e9 + 10; i++) {
        string S = to_string(i * i);
        vector<int> c(10);
        for (char x : S) c[x - '0']++;
        sq.emplace_back(i * i);
        cnt.emplace_back(c);
    }

    auto solve = [&](int N) {
        string S = to_string(N);
        vector<int> c(10);
        for (char x : S) c[x - '0']++;
        for (int i = 0; i < ssize(sq); i++) {
            bool ok = true;
            for (int j = 0; j < 10; j++) {
                if (c[j] == cnt[i][j]) continue;
                if (j == 0 && c[j] > cnt[i][j]) continue;
                ok = false;
            }
            if (ok) {
                return sq[i];
            }
        }
        return -1;
    };

    while (T--) {
        int N;
        cin >> N;
        cout << solve(N) << '\n';
    }
}