#include <bits/stdc++.h>
#define rep(x, to) for (int x = 0; x < (to); x++)
#define REP(x, a, to) for (int x = (a); x < (to); x++)
#define EPS (1e-14)
#define _PA(x,N) rep(i,N){cout<<x[i]<<" ";}cout<<endl;
#define _PA2(x,H,W) rep(i,(H)){rep(j,(W)){cout<<x[i][j]<<" ";}cout<<endl;}

using namespace std;

typedef long long ll;
typedef pair<int, int> PII;
typedef pair<ll, ll> PLL;
typedef complex<double> Complex;
typedef vector< vector<int> > Mat;

int t;
string s;

void solve() {
	string cur = s;
	while (cur.size() != 1) {
		string nxt = "";
		for (int i = 0; i < cur.size() - 1; i++) {
			int x = cur[i] - '0';
			int y = cur[i + 1] - '0';
			nxt += (((x + y) / 10 + (x + y) % 10) + '0');
		}
		cur = nxt;
	}
	cout << cur << endl;
}

int main() {
	cin >> t;
	for (int i = 0; i < t; i++) {
		cin >> s;
		solve();
	}
	return 0;
}