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;
using System.Linq;
using System.Collections;
using System.Collections.Generic;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            var X = int.Parse(Console.ReadLine());
            Console.WriteLine(Logic(X));
        }

        private static int Logic(int X)
        {
            var remain = X;
            var Happiness = 0;
            foreach(var coin in Coins)
            {
                do
                {
                    remain -= coin.Key;
                    Happiness += coin.Value;
                }
                while (remain >= coin.Key);
            }
            return Happiness;
        }

        private static Dictionary<int, int> Coins = new Dictionary<int, int> {
            { 500, 1000 },
            { 5, 5 },
            { 1, 0 }
        };
    }
}