C++ :

#include<iostream>
#include<string>

using namespace std;

int main()
{
	string sentence;
    int length,count=0;
	char word;

	getline(cin,sentence);
    length=sentence.length ();

	for (int i=0;i<length;++i)
	{
		word=sentence[i];
		if(word=='e') count++;
	}

	cout<<count<<endl;
}