#include <iostream>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <string>
#include <sstream>
#include <cmath>
#include <stack>
#include <cctype>
#include <stdio.h>
#include <map>
#include <string.h>
#include <numeric>

using namespace std;

int main() {

	int t;
	cin >> t;

	vector<int> p;

	vector<int> c;

	for (int i = 0; i < t; i++) {
		string s;
		cin >> s;

		for (int i = 0; i < s.length(); i++) {
			p.push_back(s[i] - '0');
			/*		cout<<p[i]<<endl;*/

		}

		while (p.size() > 1) {

			for (int i = 0; i < p.size() - 1; i++) {
				/*cout<<p.size()<<endl;;*/
				int tmp = p[i] + p[i + 1];

				if (tmp >= 10) {
					c.push_back(tmp / 10 + tmp % 10);
				} else {
					c.push_back(tmp);
				}

				/*			cout<<c[i];*/
			}
			/*		cout<<endl;*/
			p.clear();

			/*		cout<<p.size();*/

			copy(c.begin(), c.end(), back_inserter(p));

			c.clear();
			/*	cout<<p.size();*/
		}
		p.clear();

		cout << p[0] << endl;
	}

	return 0;
}