using System;
using System.Collections.Generic;

namespace Yukicoder
{
	public static class Program
	{
		public static void Main (string[] args)
		{
			string line = Console.ReadLine ();
			int count = 0;
			int front = 0;
			while (front < line.Length) {
				var index = line.IndexOf ("...", front);
				if (index < 0) {
					break;
				}
				if (index != front) {
					front = index;
				} else {
					front += 3;
					count++;
				}
			}
			Console.WriteLine (count.ToString ());
		}
	}
}