#include <iostream>
#include <fstream>
using namespace std;
int a,i,j,k=1,n,v[30000],p;
int main()

{
    ifstream f ("cifra.in");
    ofstream g ("cifra.out");
    f>>n;
    for (i=1;i<=n;i++)
    {
        f>>v[i];
        p=v[i];
        k=1;
        for (j=1;j<=p;j++)
        {
            if (a<10)
                k=k*p;
            else
            {
                k=k%10;
                k=k*p;
            }
        }
        a=a+k;
        g<<"A = " <<a <<endl;
        if (a>=10)
             g<<a%10 <<"\n";
        else
            g<<a <<"\n";
    }
    return 0;
}