An integer N (1 ≤ N ≤ 2×10^5), representing some quantity or size.
A list of N strings, where each string consists of lowercase English letters and has a length between 1 and 10 (inclusive).

### Example Input:

```
3
apple
orange
apple
```

### Function Signature:
Write a function f(N, A) that takes in the input.
```python
def f(N: int, A: List[str]):
    ''' 
    N: an integer 
    A: a list of strings
    '''
```