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

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

int main()
{
    int 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};
    v[0]=0;
  /*  for (int i=1;i<=100;i++)
    {
        v[i]=1;
        for (int j=1;j<=i;j++)
        {
            v[i]=v[i]*i;
            v[i]=v[i]%10;
        }
    }


    for (int i=2;i<=100;i++)
    {
        v[i]+=v[i-1];
        v[i]=v[i]%10;
    }

*/
    in >>n;

    for (int i=1;i<=n;i++)
    {
        int s=0;
        string numar;
        in >> numar;
        int a = (int) numar[numar.size()-1]-48;
        if (numar.size()>1)
        {
        numar.pop_back();
        int b = (int) numar[numar.size()-1]-48;
        a+=b*10;
        }

        out <<v[a]<<endl;

    }


// trebuie sa fac suma doar pe ultimele 100 de numere deoarece suma pe 10 este de 49 si inmultita cu 10 da un 0 la final care nu afecteaza raspunsul

}