#include <bits/stdc++.h>
using namespace std;

int main() {
	int T;
	cin >> T;
	while (T--) {
		string s;
		cin >> s;

		while (s.size() > 1) {
			string t = s;
			s = "";
			for (int i = 0; i < t.size() - 1; i++) {
				int x = t[i] - '0' + t[i + 1] - '0';
				while (x >= 10) {
					x = (x % 10) + (x / 10);
				}
				s += x + '0';
			}
		}

		cout << s << endl;
	}
}