using System;
using System.Collections;
using System.Text;
using System.Linq;
public class Program
{
public static void Main()
//int r =fact();
fact();
Console.WriteLine(" Hello World-");
}
static void fact()
string str = "Hello World";
for(int i=0;i<str.Length;i++){
int c= str.Count() - str.Replace("a","").Count();
Console.WriteLine(c);