#define _USE_MATH_DEFINES
#include<stdio.h>
#include<string>
#include<iostream>
#include<cctype>
#include<cstdio>
#include<vector>
#include<stack>
#include<algorithm>
#include<math.h>
#include<set>
#include<map>
#include<iomanip>
#include<queue>
using namespace std;

int check(string s) {
	int f1, f2;
	queue<int> q;
	for (int i = 0; i < s.length();i++) {
		q.push(s[i] - '0');
	}
	int size = q.size();

	while (q.size() != 1) {
		//cout << q.size() << endl;
		if (size == 1) {
			q.pop();
			size = q.size();
			if (size == 1) break;
		}
		f1 = q.front(); q.pop();
		f2 = q.front();
		//cout << f1 << " " << f2 << " " << endl;
		if (f1 + f2 < 10) {
			q.push(f1 + f2);
		}
		else {
			q.push(1 + (f1 + f2) % 10);
		}
		size--;
	}
	return q.front();
}

int main() {
	cin.tie(0); ios::sync_with_stdio(false);
	int T; cin >> T;
	vector<string> S(T);
	for (int i = 0; i < T; i++) {
		cin >> S[i];
	}
	for (int i = 0; i < T;i++) {
		cout << check(S[i]) << endl;
	}
	return 0;
}