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: Runtime Error)

using System;
 
class Program
{
    static void Main(string[] args)
    {
        var s = Console.ReadLine();
        int x = Int32.Parse(s);
        int happy = 0;
		
		if(x >= 500){
			var coin = x / 500;
			happy += coin * 1000;
			x = x % 500;
		}
		if(x >= 5){
			var coin = x / 5;
			happy += coin * 5;
			x = x % 5;
		}
		
		Console.WriteLine(happy);
    }
}