Description

A simple English sentence ending with '.', with words separated by spaces, containing no abbreviations or other special forms.

Input Format

A simple English sentence ending with '.' (length not exceeding 500), with words separated by spaces, containing no abbreviations or other special forms.

Output Format

The longest word in the sentence. If there are multiple words of the same maximum length, output the first one.

I am a student of Peking University.

University