#include <fstream>
#include <string.h>
using namespace std;
ifstream f1("cifra.in");
ofstream f2("cifra.out");
int main()
{
    const short int sume[20]={0,1,5,2,8,3,9,2,8,7,7,8,4,7,3,8,4,1,5,4};
    const short int s=4;
    string n;
    short int smnf, rasp=0;
    int t, asdf, l;
    f1>>t;
    for (asdf=1; asdf<=t; asdf++)
    {
        rasp=0;
        f1>>n;
        n="0"+n;
        l=n.length();
        smnf=10*n[l-2]+n[l-1]-528;
        l=smnf/20;
        rasp=l*s+sume[smnf%20];
        f2<<rasp%10<<endl;
    }
    f1.close();
    f2.close();
    return 0; 
}