Background

Description

Given two strings, a and b, create a bigger string made of the first char of a, the first char of b, the second char of a, the second char of b, and so on. Any leftover chars go at the end of the result.

Format

Input

Output

Samples

abc" "xyz

"axbycz"

Hi" "There

"HTihere"

xxxx" "There

"xTxhxexre"

Limitation

1s, 1024KiB for each test case.