#include <iostream>
#include <string>
#include <vector>
#include <cstdio>
#include <algorithm>
using namespace std;
typedef long long ll;
#define rep(i,n) for(int i=0;i<(n);i++)
const int INF = 1e9;

int main(void){
	int t; cin >> t;
	for (int i = 0; i < t; ++i){
		string s; cin >> s;
		while(s.size() != 1){
			string tmp;
			rep(i, s.size() - 1){
				int now = s[i] - '0' + s[i + 1] - '0';
				// printf("%d\n", s[i] - '0' + s[i + 1] - '0');
				// printf("now %d\n", now);
				int k;
				if(now >= 10){
					k = now / 10 + now % 10;
				}else{
					k = now;
				}
				tmp += to_string(k);
			}
			// cout << tmp << endl;
			s = tmp;
		}
		cout << s << endl;
	}
	return 0;
}