#include <iostream>
#include <cstdio>
#include <vector>
#include <algorithm>
#include <utility>
#include <string>

using namespace std;

int solve(string s) {
	vector<int> v(s.size());

	for (int i = 0; i < s.size(); i++) {
		v[i] = s[i] - '0';
	}

	while (v.size() > 1) {
		vector<int> w;
		for (int i = 1; i < v.size(); i++) {
			int tmp = v[i - 1] + v[i];
			tmp = tmp / 10 + tmp % 10;
			w.emplace_back(tmp);
		}
		v = w;
	}
	return v[0];
}

int main() {
	int t;
	string s;

	cin >> t;
	vector<int> ans(t);
	for (int i = 0; i < t; i++) {
		cin >> s;
		ans[i] = solve(s);
	}

	for (auto e : ans) {
		cout << e << endl;
	}
	return 0;
}