#include <fstream>
#include <iostream>

using namespace std;

int lastdigit[100] = {0,1,5,2,8,3,9,2,8,7,7,8,4,7,3,8,4,1,5,4,4,5,9,6,2,7,3,6,2,1,1,2,8,1,7,2,8,5,9,8,8,9,3,0,
6,1,7,0,6,5,5,6,2,5,1,6,2,9,3,2,2,3,7,4,0,5,1,4,0,9,9,0,6,9,5,0,6,3,7,6,6,7,1,8,4,9,5,
8,4,3,3,4,0,3,9,4,0,7,1,0};

/*
int gimmielastdigit(long long n)
{
    int p=1;
    for(long long i=0;i<n;++i)
    {
        p*=n;
        p%=10;
    }
    return p;
}
*/

int main()
{
    fstream f("cifra.in",ios::in);
    fstream f2("cifra.out",ios::out);
    int t;
    char n[102];
    f>>t;

    for(int i=0;i<t;i++)
    {
        f>>n;
        int l = strlen(n);
        int nr = (n[l-1]-'0');
        if(l>1) nr+=(n[l-2]-'0')*10;
        /*
        long long s=0;

        for(int i=1;i<=100;i++)
        {
            s+=gimmielastdigit(i);
            s%=10;
            lastdigit[i]=s;
            f2<<s<<",";
        }
        */

        f2<<lastdigit[nr]<<"\n";
    }

    f.close();
    f2.close();
    return 0;
}