#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
ifstream fin("cifra.in");
ofstream fout("cifra.out");
string s;
char h[105];
int n,i,p=1,j,sm,v[500],m,l,t;
int main()
{
    fin>>n;
    for (i=1;i<=99;i++)
    {
        v[i]=i;
        for (j=1;j<i;j++)
        {
            v[i]*=i;
            v[i]=v[i]%10;
        }
        v[i]=v[i]+v[i-1];
        v[i]=v[i]%10;
    }
    for(i=1;i<=n;i++)
    {
        fin>>h;
        l=strlen(h);
        if (l==1)
        {
            fout<<v[h[l-1]-'0']<<"\n";
        }
        else
        {
            fout<<v[(h[l-2]-'0')*10+(h[l-1]-'0')]<<"\n";
        }
    }
    return 0;
}