PROGRAMMING:Output character - single branch

Enter a character. If it is lowercase, convert it to uppercase. The rest of the characters remain unchanged.
###Input format and sample 1:
Enter a lowercase letter, for example:
```in
a
```
###Output format and sample 1:
Output the uppercase form of the letter, for example:
```out
A
```
###Input format and sample 2:
Enter a capital letter, for example:
```in
A
```
###Output format and sample 2:
Output the letter directly, for example:
```out
A
```
###Input format and sample 3:
Enter a numeric character, for example:
```in
five
```
###Output format and sample 3:
Output the numeric character directly, for example:
```out
five
```






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