PROGRAMMING:Longest word
Write a program to find the longest word containing the letter "a" according to an English sentence ending in ".".
###Input format:
Input 1 line, is an English sentence, ending in the period ".". The words in the sentence are written by
Separated by one or more spaces.
###Output format:
The output file has only one line and only one data. The longest one found contains the letter "a"
It's a new word. If there are multiple such words, only the first one will be displayed; If there is no word with the letter 'a', the
It shows "no".
###Input example:
```in
Her name is Lilan and she is a happy student．
```
###Output example:
```out
Lilan
```
answer：If there is no answer, please comment
###Input format:
Input 1 line, is an English sentence, ending in the period ".". The words in the sentence are written by
Separated by one or more spaces.
###Output format:
The output file has only one line and only one data. The longest one found contains the letter "a"
It's a new word. If there are multiple such words, only the first one will be displayed; If there is no word with the letter 'a', the
It shows "no".
###Input example:
```in
Her name is Lilan and she is a happy student．
```
###Output example:
```out
Lilan
```
answer：If there is no answer, please comment