#include <iostream>
using namespace std;
int main(void) {
	int t;
	cin >> t;
	string s;
	for (int i = 0; i < t; ++i) {
		cin >> s;
		while (s.size() > 1) {
			string tmp = "";
			for (int j = 0; j < s.size() - 1; ++j) {
				int a = s[j] - '0';
				a += s[j + 1] - '0';
				if (a >= 10)
					a = a / 10 + a % 10;
				tmp += a + '0';
			}
			s = tmp;
		}
		cout << s << endl;
	}
	return 0;
}