using System;
using System.IO;

class CodeOfEthics

{
   static void Main( )
   {
      StreamReader inStream = null;
      string filename = "codeofethics.txt";
      int counter = 0;
      string line;

      inStream = new StreamReader( filename );

      do
      {
      line = inStream.ReadLine( );
      line.ToLower();
         foreach(char c in line)
         {
            if(c == 'a')
            {
               counter++;
            }
         }

      }while(counter != -1);
      Console.WriteLine(counter);
      inStream.Close();

   }
}