#define _USE_MATH_DEFINES
#include<iostream>
#include<vector>
#include<algorithm>
#include<cmath>
#include<string>
#include<iomanip>
#include<numeric>
#include<queue>
#include<deque>
#include<stack>
#include<set>
#include<map>
#include<random>
using namespace std;
typedef long long ll;
const int mod=998244353;
int main(){
	int t;
	string s;
	cin>>t;
	while(cin>>s){
		while(s.size()>1){
			for(int i=0;i<s.size()-1;i++){
				s[i]+=s[i+1]-'0';
				if(s[i]>'9')
					s[i]-=9;
			}
			s.pop_back();
		}
		cout<<s<<endl;
	}
}