#include <iostream>
#include <fstream>
#include <algorithm>
#include <string>
#include <sstream>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
string s;
int main()
{
    int n,i,j,aux,sum=0,aux2;
    f>>n;
    for(i=1;i<=n;i++)
    {
        f>>s;
        j=s[s.size()-1]-'0';
        aux2=j;
        for(aux=1;aux<aux2;aux++)
            {
                j=j*aux2%10;
            }
        sum+=j;
        sum=sum%10;
        g<<sum<<'\n';
    }
    return 0;
}