#include <iostream>
#include <fstream>
#include <cmath>
#include <string>
#include <windows.h>
using namespace std;
string v[1000];
int t,s,c;
int main()
{
    ifstream f("cifra.in");
    ofstream g("cifra.out");
    f>>t;
    for (int i=1;i<=t;i++)
    {
        f>>v[i];
    }
    for (int i=1;i<=t;i++)
    {
        s=s+pow(v[i][0]-'0',v[i][0]-'0');
        g<<s%10<<"\n";

    }
    return 0;
}