#include<iostream>
#include<fstream>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
int main(void)
{
    unsigned short int s=0, t;
    f>>t;
    char q[20];
    for(int i =0; i <= t+3; i++)
        {
            f>>q[i];
            unsigned short int z = q[i] - '0', x = 1;
            q[i] = q[i] - '0';
            while (z!=0)
                {
                    x *= q[i];
                    --z;
                }
            s += x;
            g<<s%10<<endl;
            t--;
        }
        return 0;
}