#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
int t, v[101];
long long n;
char c[102];
int a[10][4]={
0,0,0,0,
1,1,1,1,
6,2,4,8,
1,3,9,7,
6,4,6,4,
5,5,5,5,
6,6,6,6,
1,7,9,3,
6,8,4,2,
1,9,1,9};

int main()
{
    int s=0;
     for(int i=0;i<=99;i++)
            {s+=a[i%10][i%4];
            v[i]=s%10;
            }
     f>>t;
    while(t--)
    {   f>>c;
        int l;
        l=strlen(c);
        if(l==1)
            n=c[0]-'0';
        else if(l==2)
             n=(c[0]-'0')*10+(c[1]-'0');
        else
            n=(c[l-2]-'0')*10+(c[l-1]-'0');
        // g<<n<<'\n';
         g<<v[n%100]<<'\n';
    }
    return 0;
}