#include <bits/stdc++.h>

using namespace std;

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

int n,y,m,b,i,j,u,e,o,minn,maxx,k,z,l[1001],c[1001],a,p,v[1001][1001],ok=0,d,r,s;
char x;

int main()
{

    f>>n;
    for (i=1; i<=n+1; i++)
    {
        f>>x;
        j=x;
        s=0;
        for (i=1;i<=j-48;i++)
        {
            s=s+pow(i,i);
        }
        g<<s%10<<endl;
    }
}