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)
            {
            string[] str = Console.ReadLine().Split(' ');
            int K = int.Parse(str[0]);
            int N = int.Parse(str[1]);
            string[] str1 = Console.ReadLine().Split(' ');
            int[] A =new int[N];
            for (int i=0;i<N;i++)
            {
                A[i] = int.Parse(str1[i]);
            }

            int a=A[N-1]-A[0];
            int b = A[N - 2] + (K - A[N - 1]);
            if(a<=b)
            {
                Console.WriteLine(a);
            }
            if(b<=a)
            {
                Console.WriteLine(b);
            }
           
            Console.ReadLine();
            }
}