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 PHP (5.6.30) (judge verdict: Wrong Answer)

<?php

fscanf(STDIN,"%d", $S);

$alpha_1 = $S[2];
$alpha_2 = $S[3];
$alpha_3 = $S[4];
$alpha_4 = $S[5];

if(($alpha_1 === $alpha_2) and ($alpha_3 === $alpha_4)){
	printf("Yes");
}else{
	printf("No");
}
return;

?>