#include<fstream>
using namespace std;
ifstream fin("cifra.in");
ofstream fout("cifra.out");

int t,u[104];
char c[104];

void uc()
{
    int i,j;
    for(i=1;i<=10;i++)
    {
        int a=1;
        for(j=1;j<=i;j++)
        {
            a=(a*i)%10;
        }
        u[i]=(u[i-1]+a)%10;
    }
}
void sol()
{
    int j;
    for(j=1; j<=t ;++j)
    {
        int x=0,i=1; c[0]='0';
        fin>>(c+1);
        while(c[i]!=0) { i++; }
        x=(c[i-2]-'0')*10+c[i-1]-'0';
        fout<<u[x]<<"\n";
    }
}
int main()
{
    fin>>t;
    uc();
    sol();
    fin.close();
    fout.close();
    return 0;
}