#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
int U[101];
ifstream f("cifra.in");
ofstream g("cifra.out");
int ucif(int n)///ultima cifra a lui n^n
{
    int uc=n%10,r=n%4,p=1;
    if(r==0)
        r=4;
    while(r--)
        p*=uc;
    return p%10;
}
void test()
{
    int s=0;
    for(int i=1;i<=100;i++)
        s+=ucif(i);
    cout<<s%10;///s=>0
}
void precalcul()
{
    U[0]=0;
    for(int i=1;i<100;i++)
        U[i]=(U[i-1]+ucif(i))%10;
}
int main()
{
    int T,ncif,rest;
    char sir[101];
    precalcul();
    f>>T;
    while(T--)
    {
        f>>sir;
        ncif=strlen(sir);
        rest=sir[ncif-1]-'0';
        if(ncif>=2)
            rest+=(sir[ncif-2]-'0')*10;
        g<<U[rest]<<'\n';
    }
    return 0;
}