#include <iostream>
#include <fstream>
#include <string.h>
#include <bits/stdc++.h>

using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
int x[101];
int cifra(int n)
{
        int p,j;
        p=1;
        for(j=1;j<=n;j++)
            p=(p*n)%10;
        return (x[n-1]+p)%10;
}
int main()
{
    int t,i;
    char N[101],z;
    int n;
    for(i=1;i<=100;i++)x[i]=0;
    x[1]=1;
    for(i=2;i<=100;i++)
    {
        x[i]=cifra(i);
    }
    f>>t;
    for(i=1;i<=t;i++)
    {
        f>>N;
        z=strlen(N);
        if(z==1)n=N[0]-'0';
        else if(z==2) n=(N[1]-'0')*10+(N[0]-'0');
        else if(z==3) n=(N[2]-'0')*100+(N[1]-'0')*10+(N[0]-'0');

        g<<cifra(n)<<'\n';
    }
    return 0;
}