#include<iostream>
#include<string>

using namespace std;

int main() {
	int i, j, n, l, a[1000];
	string s;

	cin >> n;

	for (j = 0; j < n; j++) {
		cin >> s;

		l = s.length();

		for (i = 0; i < l; i++) {
			a[i] = (s[i]) - 48;
		}

		while (l != 1) {
			for (i = 0; i < l - 1; i++) {
				a[i] += a[i + 1];
				if (a[i] > 9) {
					a[i] -= 9;
				}
			}
			l -= 1;
		}
		cout << a[0] << endl;
	}

	return 0;
}