#include <iostream>
#include <string.h>
#include <fstream>

using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
int ult(unsigned n)
{
    unsigned p,s=0,i,j;
    for( i=1; i<=n; i++)
    {
        p=1;
        for(j=1; j<=i; j++)
        {
            p*=i;
        }
        s+=p;
    }
    return s%10;
}
int main()
{
    unsigned T,i;
    char txt[200];
    f>>T;
    f.getline(txt,200);
    for( i=0; i<strlen(txt); i++)
    {
        if(txt[i]>='0' && txt[i]<='9')
            {
                g<<ult(txt[i]-'0')<<"\n";
            }
    }

}