dame

#include <iostream>
#include <string>
using namespace std;
int main(){
    int T;
    cin >> T;
    string n = "";
    for(int i = 0; i < T; i++){
        n = "";
        cin >> n;
        int len = n.size();
        bool flag = false;
        if((n[len - 1] - '0') % 2 == 0){
            cout << 0 << endl;
        }else if((n[0] - '0') % 2 == 0){
            cout << 1 << endl;
        }else{
            for(int j = 1; j < len - 1; j++){
                if((n[j] - '0') % 2 == 0){
                    flag = true;
                    break;
                }
            }
            if(flag == true){
                cout << 2 << endl;
            }else{
                cout << -1 << endl;
            }
        }
    }
    return 0;
}