#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
ifstream fin("cifra.in");
ofstream fout("cifra.out");
char s[105];
int n,i,j,v[500],l;
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>>s;
        l=strlen(s);
        if (l==1)fout<<v[s[l-1]-'0']<<'\n';
        else fout<<v[(s[l-2]-'0')*10+(s[l-1]-'0')]<<'\n';
    }
    return 0;
}