#include<bits/stdc++.h>
using namespace std;

int T;
int main(){
	cin >> T;
	while(T--){
		string s;
		int arr[2][10000];
		cin >> s;
		for(int i = 0; i < s.size(); i++){
			arr[0][i] = s[i] - '0';
		}
		for(int i = 0; i < s.size() - 1; i++){
			for(int j = 0; j < s.size() - i - 1; j++){
				int tmp  = arr[i & 1][j] + arr[i & 1][j + 1];
				if(tmp >= 10){
					tmp = (tmp % 10) + (tmp / 10);
				}
				arr[(i + 1) & 1][j] = tmp;
				//cout << arr[(i + 1) & 1][j];
			}
			//cout << endl;
		}
		cout << arr[(s.size() - 1) & 1][0] << endl;
	}
}