You are given a letter $c$. If $c$ is in uppercase, print $c$ in lowercase, and vice versa.
### Input
- A letter $c$.
### Output
- If $c$ is in lowercase, print $c$ in uppercase, and vice versa.
### Constraints
- $c$ is a letter in the alphabet, in either lowercase or uppercase.
### Example
Input:
```
C
```
Output:
```
c
```
