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 JavaScript (node.js v5.12) (judge verdict: Wrong Answer)

const main = (inputs) => {
  if (inputs[0] == inputs[1] && inputs[0] == inputs[2] && inputs[0] == inputs[4] && inputs[2] == inputs[4]) {
    console.log('No');
    return false;
  }
  if (inputs[2] != inputs[3]) {
    console.log('No');
    return false;
  }
  if (inputs[4] != inputs[5]) {
    console.log('No');
    return false;
  }
  console.log('Yes');
}
main(require('fs').readFileSync('/dev/stdin', 'UTF-8').trim().split("\n"));