CF

#include <iostream>
#include <set>
#include <vector>
#include <algorithm>
#define pb push_back
using namespace std;



void f()
{
    set <char> all;
    vector <char> v;
    for (int i = 0; i < 4; ++i) {
        char k; cin >> k;
        all.insert(k);
        v.pb(k);
    }
    if (all.size() == 1) {
        cout <<  -1;
        exit(0);
    }
    if (all.size() == 2) {
        int x = count(v.begin(), v.end(), v[0]);
        if (x == 1 || x == 3) {
            cout << 6;
            exit(0);
        }
    }
    cout << 4;
}

int main()
{
    int t; cin >> t;
    for (int i = 0; i < t; ++i) {
        f();
    }
}