#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <algorithm>
#include <utility>
#include <functional>
#include <cstring>
#include <queue>
#include <stack>
#include <math.h>
#include <iterator>
#include <vector>
#include <string>
#include <set>
#include <math.h>
#include <iostream> 
#include<map>
#include <iomanip>
#include <stdlib.h>
#include <list>
#include <typeinfo>
#include <list>
#include <set>
using namespace std;
#define MAX_MOD 1000000007
#define REP(i,n) for(long long i = 0;i < n;++i)
#define LONGINF 1000000000000000000
int wow[10000] = {};
int main() {
	int t;
	cin >> t;
	for (int i = 0;i < t;++i) {
		string s;
		cin >> s;
		REP(i, s.length()) {
			wow[i] = (int)s[i] - '0';
		}
		for (int i = 0;i < s.length() - 1;++i) {
			for (int q = 0;q < s.length()-i-1;++q) {
				wow[q] = wow[q] + wow[q+1];
				if (wow[q] >= 10) {
					wow[q] = 1 + (wow[q] % 10);
				}
			}
		}
		cout << wow[0] << endl;
	}
	return 0;
}