Odd Screams

You will be given a string with one or more a’s. You have to write a regular expression that matches the string only if the number of a’s in the string is odd.

Input

The input will contain a string with one or more a’s. The string will have at most 25 characters.

Output

Output the string only if it has an odd number of a’s.

Samples

Input	Output
aaa	aaa

Input	Output
aa