#include<iostream>
using namespace std;
int main()
{
    int a,s;
    cin>>a;
    cin>>s;
    if(a<0||s<0)
    {
        cout<<"Invalid input";
    }
    else iuf(s<a)
    {
        cout<<"Error: Insufficient Slots";
    }
    else
    {
        cout<<"Enrollment successful";
    }
    return 0;
}