Background

Description

Given a string, return a string made of the chars at indexes 0,1, 4,5, 8,9 ... so "kittens" yields "kien".

Format

Input

Output

Samples

kitten

"kien"

Chocolate

"Chole"

CodingHorror

"Congrr"

Limitation

1s, 1024KiB for each test case.