#include <bits/stdc++.h>
#define REP(i,n,N) for(int i=(n);i<(int) N;i++)
#define p(s) cout<<(s)<<endl
using namespace std;

int main(){
	int T;
	cin>>T;
	string s;
	REP(i,0,T){
		cin>>s;
		while(s.size()>1){
			REP(k,0,s.size()-1){
				int a=s[k]-'0'+s[k+1]-'0';
				if(a>=10){
					a=a/10+a%10;
				}
				s[k] =(char) a+'0';
			}
			s.erase(s.size()-1);
		}
		p(s);
	}
	return 0;
}