#include <fstream>
#include <cstring>

using namespace std;

int main()
{
    ifstream f("cifra.in");
    ofstream g("cifra.out");
    int n ,x, j , k , i,S=0,cnt;
    char a[105];
    f >> n;
    f.getline(a,10);
    for (i=1;i<=n;i++)
    {
        f.getline(a,105);
        x=strlen(a);
        if(x==1)
            x = a[0]-'0';
        else
            x = (a[x-2] - '0') * 10 + a[x-1] - '0';
        for (j=1;j<=x;j++)
        {
            cnt=1;
            for (k=1;k<=j;k++)
                {
                    cnt=cnt*j;
                    cnt=cnt%10;
                }
            S=S+cnt;
        }
    S=S%10;
    g << S << '\n';
    S=0;
    }
}