#include<bits/stdc++.h>
using namespace std;
int main()
{
	char a[10];
	int b=0,c=0;
	for(int i=0;i<4;i++)
	{
	    cin >> a[i];
	    if(a[i]=='D')
	    {
	        cout << "Never give up.";
	        return 0;
	    }
	    if(a[i]=='A')
	    {
	        ++b;
	    }
	    if(a[i]=='B')
	    {
	        ++c;
	    }
	}
	if(b>1&&(b+c==4))
	{
	    cout << "I'm so happy.";
	}
	else
	{
	    cout << "This is ok.";
	}
}