#include "bits/stdc++.h"
#define _CRT_SECURE_NO_WARNINGS
#define rep(i,n) for(int i = 0;i < n;i++)
#define REP(i,n,k) for(int i = n;i < k;i++)
#define P(p) cout << (p) << endl;
#define sP(p) cout << setprecision(15) << fixed << p << endl;
#define Pi pair<int,int>
#define IINF 1e9
#define LINF 1e18
#define vi vector<int>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
int dx[] = { 1, 0,-1,0 };
int dy[] = { 0, 1,0,-1 };

void solve() {
	int t;
	cin >> t;
	rep(i, t) {
		string s;
		cin >> s;
		string ans = s;
		while (ans.length() != 1) {
			string tmp = "";
			rep(i, ans.length()-1) {
				int n = (ans[i] - '0') + (ans[i + 1] - '0');
				if (n >= 10) {
					n = n / 10 + n % 10;
				}
				tmp = tmp + to_string(n);
			}
			ans = tmp;
		}
		P(ans);
	}
}

int main() {
	solve();
	return 0;
}