PROGRAMMING:Who is the highest

Xiao Hong, Xiao Ming and Wang Hua are worried about one thing recently. They don't know who is the highest. Please help to see who is the highest. Xiao Hong: A, Xiao Ming: B, Wang Hua: C. Finally, output the letters corresponding to the name. If not only one person is the tallest, output the letters in dictionary order, and there is no space at the end.
###Input format:
Enter the height of Xiaohong, Xiaoming and Wang Hua in turn (two valid decimal places).
###Output format:
The letter of the tallest person.
###Input sample 1:
Here is a set of inputs. For example:
```in
***
```
###Output sample 1:
The corresponding output is given here. For example:
```out
C
```
###Input sample 2:
Here is a set of inputs. For example:
```in
177.10 177.10 177.10
```
###Output sample 2:
The corresponding output is given here. For example:
```out
A B C
```







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