Background

Description

Given a string, return a string made of the first 2 chars (if present), however include first char only if it is 'o' and include the second only if it is 'z', so "ozymandias" yields "oz".

Format

Input

Output

Samples

ozymandias

"oz"

bzoo

"z"

oxx

"o"

Limitation

1s, 1024KiB for each test case.