#include <iostream>
#include <fstream>
#include <cmath>
#include <string>
using namespace std;
string v[10000];
int i,x,n,s;
int main(void)
{
        ifstream f("cifra.in");
        ofstream g("cifra.out");
        f>>n;
        for (int i=1;i<=n;i++)
        f>>v[i];
        for (int i=1;i<=n;i++)
        {
        s=s+pow(v[i][0]-'0',v[i][0]-'0');
        g<<s%10<<"\n";
        }

    return 0;
}