#include <bits/stdc++.h>
using namespace std;
int a[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
int Q; string s;
int main() {
	cin >> Q;
	while(Q--) {
		cin >> s;
		while(s.size() > 1) {
			string t;
			for(int i = 1; i < s.size(); i++) t += a[(s[i] - 48) + (s[i - 1] - 48)] + 48;
			s = t;
		}
		cout << s << endl;
	}
}