#include <bits/stdc++.h>
#define NMAX 1000001

using namespace std;

ifstream f("cifra.in");
ofstream g("cifra.out");

int v[]= {1,5,2,8,3,9,2,8,7,7,8,4,7,3,8,4,1,5,4};

int main()
{
    int n,t,m,sum=0;
    char s[NMAX];
    f>>n;
    f.get();
    for (int i=0; i<n; i++)
    {
        f.getline(s,105);
        t=strlen(s);
        if(t>=2) m=(s[t-2]-'0')*10+(s[t-1]-'0');
        else m=s[t-1]-'0';
        sum=(4*(m/20)+v[m%20-1])%10;
        g<<sum<<'\n';
    }
    f.close();
    g.close();
}