#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using a2 = array<ll, 2>;
using a3 = array<ll, 3>;

template <typename A>
void chmin(A &l, const A &r) {
    if (r < l)
        l = r;
}
template <typename A>
void chmax(A &l, const A &r) {
    if (l < r)
        l = r;
}

ll mod = 998244353;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);

    ll t;
    cin >> t;
    map<string, ll> mp;
    for (ll i = 1; i * i <= 1000000005; i++) {
        string s = to_string(i * i);
        sort(s.begin(), s.end());
        while (s.size() < 10) {
            if (mp.contains(s) == false)
                mp[s] = i * i;
            s.insert(s.begin(), '0');
        }
    }
    for (int tt = 0; tt < t; tt++) {
        string s;
        cin >> s;
        sort(s.begin(), s.end());

        if (mp.contains(s))
            cout << mp[s] << endl;
        else
            cout << -1 << endl;
    }

    return 0;
}