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 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include<stdio.h>

int main()
{
  char str[6];
  int flag = 0;
  
  scanf("%s", str);
  
  if(str[2] == str[3] && str[4] == str[5])
  {
    if(str[3] != str[4] && str[0] != str[1])
    {
      if(str[1] != str[2])
        flag = 1;
    }
  }
  
  if(flag == 1)
    printf("Yes\n");
  
  else
    printf("No\n");
  
  return 0;
}