#include<iostream>
#include<fstream>
#include<cstring>
using namespace std;

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

int V[20]={0,1,5,2,8,3,9,2,8,7,7,8,4,7,3,8,4,1,5,4};
char x[102];

int main()
{
    int i,T, nr;
    f>>T;
    for (i=1; i<=T; i++)
    {
        f>>(x+1);
        x[0]='0';
        int n=strlen(x);
        nr=(int(x[n-2])-48)*10+int(x[n-1])-48;
        g<<((nr/20)*4+V[nr%20])%10<<'\n';
    }
    f.close();
    g.close();
    return 0;
}