PROGRAMMING:Loop - n characters

First input a positive integer n, and then input n characters, if all capital letters, output perfect; If all lowercase letters, output good; If it is all digital, output nice. If the first three cases do not meet the output OK
###Input format:
First, enter a positive integer n,
Then enter n characters.
###Output format:
If all capital letters, output perfect; If all lowercase letters, output good; If it is all digital, output nice. If the first three cases do not meet the output OK
###Input example:
```in
ten
ABCDEABCDE
```
###Output example:
The corresponding output is given here. For example:
```out
perfect
```







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