#include <bits/stdc++.h>
using namespace std;
using ll = long long; 
#ifdef LOCAL
#include <debug.h>
#else
#define dbg(...) 0
#define dbgn(...) 0
#endif

map<vector<int>, int> mp; 

void solve(){
	int n; 
	cin >> n; 
	vector<int> v(10); 
	while(n){
		v[n % 10]++; 
		n /= 10; 
	}
	dbg(v); 
	int mx = v[0]; 
	for(int i = 0; i <= mx; i++){
		v[0] = i; 
		if(mp[v] != 0) {
			cout << mp[v] << '\n'; 
			return; 
		}
	}
	cout << -1 << '\n'; 
}

int32_t main() {
    cin.tie(0)->sync_with_stdio(0);
    for(int i = 1; i * i <= 1e9; i++){
    	int c = i * i; 
    	vector<int> v(10); 
    	while(c){
    		v[c % 10]++; 
    		c /= 10; 
    	}
    	if(mp[v] == 0) mp[v] = i * i; 
    }
    int tt; 
    cin >> tt; 
    while(tt--){
        solve(); 
    }
    return 0; 
}