using System;

namespace March22
{	
	class StringEx
	{	
		//Count the occurence of letter 'e' in inputed string
		public static int OccurOfE(String s)
		{
			int occurence = 0;
			for(int i = 0; i<s.Length; i++)
			{
				if(s[i] == 'e')
					occurence++;
			}
			return occurence;
		}	

		public static void Main()
		{
			Console.WriteLine("Please input a line");
            string s = Console.ReadLine();
			Console.WriteLine("Number of occurence of 'e' is "+ OccurOfE(s));
		}
	}
}