#include <bits/stdc++.h>
using namespace std;
int main(){
    int a;
    while(a--){
        char b,c,d,e,f;
        cin >> b >> c >> d >> e;
        if(b == c && b == d && b == e){
            cout << 0 << endl;
        }else if(b != c && b !=d && b != e){
            cout << 3 << endl;
        }else if((b == c && d == e) || (b == d && c == e) || (b == e && c == d) || (b == c && b == d) || (b == d && b == e) || (b == c && b == d)){
            cout << 1 << endl;
        }else{
            cout << 2 << endl;
        }
    }
    return 0;
}