2个点RE,求帮

#include <bits/stdc++.h>
using namespace std;

int cnt=0;
int main() {
    string s;
	cin>>s;
	for(int i=0;i<s.size()-4;i++){
		if(s[i]=='l'&&s[i+1]=='u'&&s[i+2]=='o'&&s[i+3]=='g'&&s[i+4]=='u'){
			cnt++;
		}
	}
	cout<<cnt<<endl;
	return 0;
}