#include<iostream>
#include<string>
#define S size()
using namespace std;

int main() {
	string Sn;
	int T;
	cin >> T;
	while (T--) {
		cin >> Sn;
		while(Sn.S != 1){
			string N;
			for (int i = 0; i < (int)Sn.S-1; i++) {
				int box = (Sn[i] - '0')+ (Sn[i + 1] - '0');
				if (box >= 10) box = box / 10 + box % 10;
				N += box + '0';

			}
			Sn = N;
		}
		cout << Sn << endl;
	}
	return EXIT_SUCCESS;
}