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 Perl (v5.18.2) (judge verdict: Wrong Answer)

my ($k,$n) = split(/ /,<STDIN>);
my @a = split(/ /,<STDIN>);my @diff= ();my $diff;
while ($n > 0){$diff = abs($a[$n-1]-$a[$n-2]);if($diff>$k-$diff){push(@diff,$k-$diff)} else{push(@diff,$diff)};$n--;}
my @sorted = sort{$a<=>$b}@diff;
print $diff[0],"\n";