#include <iostream>
#include <string>
using namespace std;
void deal(string &S)
{
	if (S.length()==1){
		cout<<S<<endl;
		return;
	}
	int i;
	string T="";
	for (i=0;i<S.length()-1;i++){
		int  ch1=S[i]-'0';
		int  ch2=S[i+1]-'0';
		int ch=ch1+ch2;
		if (ch>=10){
			int x=ch/10+ch%10;
			ch = x;
		}
		char cch=ch+'0';
		if (i==0){
			T=cch;
		}else{
			T+=cch;
		}
	}
	deal(T);
	return;
}
int main(int argc, char* argv[])
{
	int N;
	cin>>N;
	int i;
	for (i=0;i<N;i++){
		string S;
		cin>>S;
		deal(S);
	}
	return 0;
}