#include <fstream>
#include <string>

using namespace std;

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

int i,j,result,nr,t,lungime;
const int matrice[10][4]={{0,0,0,0},{1,1,1,1},{6,2,4,8},{1,3,9,7},{6,4,6,4},{5,5,5,5},{6,6,6,6},{1,7,9,3},{6,8,4,2},{1,9,1,9}};
const int rezultate[100]={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};
string n;

int main()
{
    f>>t;
    for(i=0;i<t;i++)
    {
       f>>n;
       lungime=n.size();
       nr=(int(n[lungime-2])-48)*10+(int(n[lungime-1])-48);
       g<<rezultate[nr]<<'\n';
    }
    return 0;
}

//20-4