#include <iostream>
#include <string>

void solve(){
	std::string s;
	
	std::cin >> s;
	
	while(s.length() != 1){
		std::string s2;
		for(int i = 0; i < s.length() - 1; ++i){
			int t = (s[i] - '0') + (s[i + 1] - '0');
			if(t / 10 != 0){
				t = t % 10 + t / 10;
			}
			s2 += t + '0';
		}
		s = s2;
	}
	std::cout << s << std::endl;
}

int main() {
	int test_case;
	
	std::cin >> test_case;
	
	for(int i = 0; i < test_case; ++i){
		solve();
	}
	
	return 0;
}