#include<bits/stdc++.h>
using namespace std;
#define rep(i,a,b) for(int i=a;i<b;i++)





int sol(string S) {
    vector<int> v;
    for (char c : S) v.push_back(c - '0');
    int sm = 0;
    for (int i : v) sm += i;
    if (sm == 0) return 0;
    
    while (1 < v.size()) {
        vector<int> vv;
        rep(i, 0, v.size() - 1) {
            vv.push_back((v[i] + v[i + 1]) % 9);
        }
        swap(v, vv);
    }
    if (v[0] == 0) v[0] = 9;
    return v[0];
}
//-----------------------------------------------------------------------------------
int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);

    int T; cin >> T;
    rep(t, 0, T) {
        string s; cin >> s;
        printf("%d\n", sol(s));
    }
}