0,1,5,2,8,3,9,2,8,7,7,8,4,7,3,8,4,1,5,4,4,5,9,6,2,7,3,6,2,1,1,2,8,1,7,2,8,5,9,8,8,9,3,0,6,1,7,0,6,5,5,6,2,5,1,6#include <fstream>
#include <iostream>
#include <math.h>;
#include <string.h>
using namespace std;

ifstream fin ("cifra.in");
ofstream fout("cifra.out");

int ultima_cifra(int n){
    int rezultat= 1 ;
    for(int i =1;i <= n;++i){
    rezultat =(rezultat* n%10)%10;
    }
    return rezultat;
}

int main()
{
    int t;
    fin >> t;
    long long int n,i,nr;
    /*
    for(int i=1;i<=t;++i){
        cin >> n;
        nr=pow(n,n);
        s+=nr%10;
        cout << s%10 << '\n';
    }*/
        int v[101]={0,1,5,2,8,3,9,2,8,7,7,8,4,7,3,8,4,1,5,4,4,5,9,6,2,7,3,6,2,1,1,2,8,1,7,2,8,5,9,8,8,9,3,0,6,1,7,0,6,5,5,6,2,5,1,6,2,9,3,2,2,3,7,4,0,5,1,4,0,9,9,0,6,9,5,0,6,3,7,6,6,7,1,8,4,9,5,8,4,3,3,4,0,3,9,4,0,7,1,0,0};
char s[255];
fin.get();
for(i=1;i<=t;i++)
{
    fin.getline(s,100);
    //fout << s << "\n";
    n=strlen(s)-1;
    if(n>=2)
    n=(s[n-1]-'0')*10+(s[n]-'0');
    else n = s[n]-'0';
    fout<<v[n] << "\n";
}
    return 0;
}

/**
n ^ n


**/