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 Fortran (gfortran v4.8.4) (judge verdict: Wrong Answer)

program main
    implicit none
    integer i, flag
    character s*6
    read(*,*) s

    flag = 0
    if (s(3:3) == s(4:4)) then
        flag = 0
    else 
        flag = 1
    end if

    if (flag == 1) then
        if(s(5:5) == s(6:6)) then
            flag = 0
        else 
            flag = 1
        end if
    end if

    if (flag == 0) then
        write(*,*) "Yes"
    else if (flag == 1) then
        write(*,*) "No"
    end if

end program