#include <bits/stdc++.h>

using namespace std;

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    int T;
    cin >> T;
    for (int i = 0; i < T; i++) {
        string s;
        cin >> s;
        int n = s.length();
        vector<int> a(n);
        for (int j = 0; j < n; j++) a[j] = s[j] - '0';
        for (int j = 0; j < n - 1; j++) {
            vector<int> tmp((int)a.size());
            for (int k = 0; k < (int)a.size() - 1; k++) {
                int sum = a[k] + a[k + 1];
                sum = sum / 10 + sum % 10;
                tmp[k] = sum;
            }
            a = tmp;
        }
        cout << a[0] << endl;
    }
    return 0;
}