#include<fstream>
#include<cstring>
using namespace std;
ifstream in1("cifra.in"), in2("cifra2.in");
ofstream out1("cifra.out"), out2("cifra2.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;
    in1>>T;
    while(T--)
    {
        in1>>N;
        if(N[1]==0) n=N[0]-'0';
        else n=(N[strlen(N)-2]-'0')*10+N[strlen(N)-1]-'0';
        out1<<s[n%100]<<'\n';
    }
}