Background

Description

Given 2 strings, a and b, return a string of the form short+long+short, with the shorter string on the outside and the longer string on the inside. The strings will not be the same length, but they may be empty (length 0).

Format

Input

Output

Samples

Hello" "hi

"hiHellohi"

hi" "Hello

"hiHellohi"

aaa" "b

"baaab"

Limitation

1s, 1024KiB for each test case.