#include<fstream>
using namespace std;
ifstream cin("cifra.in");
ofstream cout("cifra.out");
int s[105],T,n;
char N[105];
int Pow(int b,int e)
{
    int r=1;
    while(e>1)
    {
        if(e%2==1) r=r*b;
        b=b*b; e/=2;
    }
    return r*b;
}
int main()
{
    for(int i=1;i<=99;i++)
        s[i]=(s[i-1]+Pow(i%10,(i%100-1)%4+1))%10;
    cin>>T;
    while(T--)
    {
        cin>>N;
        if(N[1]==0) n=N[0]-'0';
        else n=(N[1]-'0')*10+N[0]-'0';
        cout<<s[n%100]<<'\n';
    }
}