#include <bits/stdc++.h>

//const static double	de_PI	= 3.14159265358979323846;
//const static int	de_MOD	= 1000000007;
//const static int	de_MAX	= 999999999;
//const static int	de_MIN = -999999999;

int main(void) {

	//std::ifstream in("123.txt");	std::cin.rdbuf(in.rdbuf());

	int T = 0; std::cin >> T;
	std::vector<int> ans(T);
	for (int i = 0; i < T; i++) {
		std::string S;
		std::cin >> S;
		std::vector<int> A(S.length());
		for (unsigned int j = 0; j < S.length(); j++) { A[j] = S[j] - '0'; }

		while (A.size() > 1) {
			std::vector<int> nextA(A.size() - 1);
			for (unsigned int j = 0; j < A.size() - 1; j++) {
				nextA[j] = (A[j] + A[j + 1]) % 10 + (A[j] + A[j + 1]) / 10;
			}
			A.clear();
			A = nextA;
		}

		ans[i] = A[0];
	}

	for (int i = 0; i < T; i++) {
		std::cout << ans[i] << std::endl;
	}
}