#include<bits/stdc++.h>

using namespace std;

int t;
string s;
int a[100]={
		0,1,5,2,8,3,9,2,8,7,7,8,4,7,3,8,4,1,5,4,
    };
int b[100]={
		0,1,4,7,6,5,6,3,6,9,0,1,6,3,6,5,6,7,4,9,
		0,1,4,7,6,5,6,3,6,9,0,1,6,3,6,5,6,7,4,9,
		0,1,4,7,6,5,6,3,6,9,0,1,6,3,6,5,6,7,4,9,
		0,1,4,7,6,5,6,3,6,9,0,1,6,3,6,5,6,7,4,9,
		0,1,4,7,6,5,6,3,6,9,0,1,6,3,6,5,6,7,4,9
    };
int main(){
	ifstream fin("cifra.in");
	ofstream fout("cifra.out");
	fin>>t;
	for(int i=1;i<=t;i++){
	    fin>>s;
	    for(int i=1;i<=(int(s[s.length()-2]-48)*10+int(s[s.length()-1]-48));i++){
	        a[i]=(b[i]+a[i-1])%10;
	    }
	    fout<<a[int(s[s.length()-2]-48)*10+int(s[s.length()-1]-48)];
	}
return 0;
}