#include <iostream>
#include <fstream>
#include <string>
using namespace std;

int pow[10][4];
int a10[10];
int a20[10];

int results[101];

int p[30001];

void initPow() 
{
	for(int i=1;i<=10;++i)
	{
		int a = 1;
		for(int j=0;j<4;++j) 
		{
			a *= i;
			a %=10;
			pow[i-1][j] = a;
		}
	}

	int start = 0;
	int result = 0;
	for(int j=1;j<=100;++j)
	{
		result = (result+pow[(j-1)%10][start])%10;
		start = (start+1)%4;
		results[j] = result;
	}
}

int main(void) 
{
	ifstream in;
	ofstream out;
	string line;
	int t;

	initPow();
	in.open("cifra.in");
	out.open("cifra.out");

	in >> t;
	for(int i=0;i<t;++i)
	{
		in >> line;
		int result = 0;
		size_t length = line.length();
		if(length >= 2) 
		{
			int a1 = line.at(length - 2) - '0';
			result = 10*a1;
		}
		int a2 = line.at(length - 1) - '0';
		result += a2;
		p[i] =  results[result];
		//out << results[result] << endl;
	}
	
	for(int i=0;i<t;++i)
		out << p[i] << endl;

	in.close();
	out.close();
	return 0;
}