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

int pow[9][4];
int results[100];

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

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

int main(void) 
{
	ifstream in;
	ofstream out;
	//string line;
	char line[101];
	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 = strlen(line);
		if(length >= 2) 
		{
			result = line[length - 2] - '0';
		}
		result += line[length - 1] - '0';
		
		out << results[result-1] << endl;
	}
	in.close();
	out.close();
	return 0;
}