#include <iostream>
#include<math.h>
#include<fstream>
using namespace std;

//https://www.infoarena.ro/problema/cifra

ifstream fin("cifra.in");
ofstream fout("cifra.out");

int main()
{
    int suma=1,i,a=0,n1;
    fin>>n1;
    char sir[n1];
    for(i=0; i<n1; i++)
    {
        fin>>sir[i];
    }
    for(i=0; i<n1; i++)
    {
        a=a*10+(sir[i]-48);
    }
    int invers=0;
    while(a!=0)
    {
        invers=invers*10+a%10;
        a=a/10;
    }
    a=invers;
    while(a!=0)
    {
        for(i=1; i<=a%10; i++)
        {
            suma=0;
            for(int j=1; j<=i; j++)
            {
                suma=(suma+pow(j,j));
            }
        }
        fout<<suma%10<<"\n";
        a=a/10;
    }
    fin.close();
    fout.close();
    return 0;
}