First Two Chars

Background

No specific background provided.

Problem Description

Given a string, return a string made of the first 2 characters (if present). However, include the first character only if it is 'o' and include the second character only if it is 'z'. For example, "ozymandias" yields "oz".

Input Format

Input is given from standard input in the following format.

s

Output Format

Output is printed to standard output in the following format.

result

Sample

ozymandias

"oz"

bzoo

"z"

oxx

"o"

Constraints

Time limit: 1s, Memory limit: 1024KiB for each test case.