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

using ll = long long;

bool chmin(auto &a, auto b) { return a > b ? a = b, true : false; }
bool chmax(auto &a, auto b) { return a < b ? a = b, true : false; }

map<string, int> mp;

void solve() {
    string N; cin >> N;
    while(N.size() < 10) N += '0';
    sort(N.begin(), N.end());
    if(mp.count(N)) cout << mp[N] << endl;
    else cout << -1 << endl;
    return;
}

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

    for(int i=1; i*i<=1'000'000'000; ++i) {
        int y = i*i;
        string x = to_string(y);
        while(x.size() < 10) x += '0';
        sort(x.begin(), x.end());
        if(!mp.count(x)) mp[x] = y;
    }
    int T; cin >> T;
    for(int i=0; i<T; ++i) solve();
}