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 Ruby (2.3.3) (judge verdict: Accepted)

ALP = ('a'..'z').to_a
INF = 0xffffffffffffffff
# mod = 998244353
# mod = 10 ** 9 + 9
mod = 10 ** 9 + 7
PI = Math::PI
dx = [ 1,  0, -1,  0,  1,  1, -1, -1]
dy = [ 0,  1,  0, -1,  1, -1,  1, -1]
eight = [0, 1, 1, 0, -1, -1, 1, -1, 0]
def max(a,b);       a > b ? a : b                              end
def min(a,b);       a < b ?  a : b                             end
def swap(a,b);      a, b = b, a                                end
def gi;             gets.to_i                                  end
def gf;             gets.to_f                                  end
def gs;             gets.chomp                                 end
def gai(n=nil); n.nil? ? gets.split.map(&:to_i) : n.times.map{ gets.to_i } end
def gaf(n=nil); n.nil? ? gets.split.map(&:to_f) : n.times.map{ gets.to_f } end
def gas(n=nil); n.nil? ? gets.split : n.times.map{ gets.chomp } end
def ga2i(h);        h.times.map{ gets.split.map(&:to_i) }      end
def yn(f); puts f ? "Yes" : "No" end
def YN(f); puts f ? "YES" : "NO" end
def yes(f=nil); f.nil? ? (puts "Yes"; exit) : (puts f ? "Yes" : "No") end
def no(f=nil); f.nil? ? (puts "No"; exit) : (puts f ? "Yes" : "No") end
def yay(f=nil); f.nil? ? (puts "Yay!"; exit) : (puts f ? "Yay!" : ":(") end

s = gs

yn(s[2]==s[3] && s[4]==s[5])