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