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.Collections.Generic;

namespace _20200328_ABC160A
{
    class Program
    {
        static void Main(string[] args)
        {
            var input = ReadStringList(1);

            char[] cArray = input[0].ToCharArray();

            string output = "No";
            if (cArray[2] == cArray[3])
            {
                if (cArray[4] == cArray[5])
                {
                    output = "Yes";
                }
            }

            Console.WriteLine(output);
        }

        private static List<string> ReadStringList(int numberOfLines)
        {
            var stringList = new List<string>();

            for (int lineIndex = 0; lineIndex < numberOfLines; lineIndex++)
            {
                stringList.Add(Console.ReadLine().Trim());
            }

            return stringList;
        }

    }
}