#include <iostream>
#include <vector>
#include <string>

void solve() {
    std::string s;
    std::cin >> s;

    int n = s.length();
    std::vector<int> xs(n);
    for (int i = 0; i < n; ++i) xs[i] = s[i] - '0';

    while (n > 1) {
        for (int i = 0; i + 1 < n; ++i) {
            xs[i] += xs[i + 1];
            while (xs[i] >= 10) xs[i] -= 9;
        }
        xs.pop_back();
        --n;
    }

    std::cout << xs.front() << std::endl;
}

int main() {
    std::cin.tie(nullptr);
    std::ios::sync_with_stdio(false);

    int q;
    std::cin >> q;
    while (q--) solve();

    return 0;
}