Problem:
Score : 100 points

Problem Statement

A string of length 6 consisting of lowercase English letters is said to be coffee-like if and only if its 3-rd and 4-th characters are equal and its 5-th and 6-th characters are also equal.

Given a string S, determine whether it is coffee-like.

Constraints

S is a string of length 6 consisting of lowercase English letters.

Input

Input is given from Standard Input in the following format:

S

Output

If S is coffee-like, print Yes; otherwise, print No.

Sample Input 1

sippuu

Sample Output 1

Yes

In sippuu, the 3-rd and 4-th characters are equal, and the 5-th and 6-th characters are also equal.

Sample Input 2

iphone

Sample Output 2

No

Sample Input 3

coffee

Sample Output 3

Yes

Solution in C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
using System.IO;

namespace AtCoder {
	class Program {
		public static void Main(string[] args) {
			Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false });

			string str = Console.ReadLine();
			if (str[2] == str[3] && str[4] == str[5]) {
				Console.WriteLine("Yes");
			} else {
				Console.WriteLine("No");
			}

			Console.Out.Flush();
		}
	}
}