PROGRAMMING:Find the longest word - heboost

Find the longest word (words of different lengths appear only once).
###Input format:
The input format is single line, and spaces are used between words.
###Output format:
The output format is the longest word.
###Input example:
Here is a set of inputs. For example:
```in
an not need happy suggest
```
###Output example:
The corresponding output is given here. For example:
```out
suggest
```







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