#include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <stack>
#include <queue>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <ctime>

using namespace std;

typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<string> VS;
typedef pair<int, int> PII;
typedef long long LL;

#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n)  FOR(i,0,n)

#define MP make_pair
#define MT make_tuple
#define EACH(i,c) for(auto i: c)
#define SORT(c) sort((c).begin(),(c).end())

#define ALL(a)  (a).begin(),(a).end()
#define RALL(a) (a).rbegin(), (a).rend()

int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);

	int T;
	cin >> T;
	while(T--){
		string S;
		cin >> S;

		while(S.length() > 1){
			int n = S.length();
			string tmp = "";
			REP(i, n - 1){
				int t = S[i] - '0' + S[i + 1] - '0';
				tmp = tmp + to_string(t / 10 + t % 10);
			}
			S = tmp;
			//cout << S << endl;
		}

		cout << S << endl;
	}


	return 0;
}