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

int main()
{
    ifstream f("cifra.in");
    ofstream g("cifra.out");
    int v[]={0,1,4,7,6,5,6,3,6,9};
    int t,i,j,s;
    f>>t; char x;
    for(i=0;i<t;i++){
        f>>x;
            s=0;
            if(x-'0'<10)
            for (j=1;j<=x-'0';j++){
                s+=v[j];
                s%=10;
            }
            g<<s%10<<"\n";
        }
    return 0;
}