The Caesar Cipher is a simple encryption technique that shifts each letter in the plaintext by a fixed number of positions down or up the alphabet.
For example, with a shift of $3$:
- `a` becomes `d`.
- `b` becomes `e`.
- `hello` becomes `khoor`.
- `zoo` becomes `crr`.
Write a program that takes as input a string and a shift value, and performs encryption using the Caesar Cipher.
### Input
- The first line contains a string $S$ consisting of lowercase letters and spaces.
- The second line contains an integer $k$ $(0 \leq k \leq 25)$, the shift value.
### Output
- Print the encrypted string after shifting each letter in $S$ by $k$ positions.
### Constraints
- $1 \le |S| \le 1000$.
- $0 \le k \le 25$.
### Sample test
```
marisa
3
```
Output:
```
pdulvd
```
