#include <bits/stdc++.h>
#include <atcoder/all>
#include <boost/multiprecision/cpp_dec_float.hpp>
#include <boost/multiprecision/cpp_int.hpp>
namespace mp = boost::multiprecision;
using Bint = mp::cpp_int;
using namespace std;
using namespace atcoder;
#define rep(i, n) for(int i=0;i<(n);++i)
#define rep1(i, n) for(int i=1;i<=(n);i++)
#define ll long long
using mint = modint998244353;
using P = pair<ll,ll>;
using lb = long double;
using T = tuple<ll, ll, ll>;
#ifdef LOCAL
#  include <debug_print.hpp>
#  define dbg(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#  define dbg(...) (static_cast<void>(0))
#endif

int main()
{
  int t;
  cin >> t;
  map<vector<int>, int> mp;
  for(int i=1;i*i<=1e9+5;i++) {
    int v = i*i;
    string t = to_string(v);
    vector<int> vs(10);
    for(char c: t) if(c!='0') vs[c-'0']++;
    if(!mp.count(vs)) mp[vs] = v;
    else mp[vs] = min(mp[vs], v);
  }
  while(t--) {
    int n;
    cin >> n;
    string t = to_string(n);
    vector<int> vs(10);
    for(char c: t) if(c!='0') vs[c-'0']++;
    if(!mp.count(vs)) cout << -1 << "\n";
    else cout << mp[vs] << endl;
  }
  return 0;
}