#include <fstream>
#include <iomanip>
#include <string>

using namespace std;
fstream fin("cifra.in",ios::in),fout("cifra.out",ios::out);
int r[21]={0,1,5,2,8,3,9,2,8,7,7,8,4,7,3,8,4,1,5,4,4},v;
char N[200];
int t,i,l;
int main(){
    fin>>t;
    for (i=1;i<=t;i++){
      fin>>N;l=strlen(N);
      if (l==1) v=N[0]-48;
      else v=(N[l-2]-48)*10+N[l-1]-48;         
      fout<<(4*(v/20)+r[v%20])%10<<"\n";
    }        
   fin.close(); fout.close();
   return 0;
}