In this task, you need to count the number of words in a sentence that contain the given letter

Ex Input:
Sentence: 'a smiling man holds out a card with color swatches'. How many words contain the letter 'i' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a sandwich shop with cars parked in front of it'. How many words contain the letter 'u' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a large city bus parked outside an apartment building'. How many words contain the letter 'n' in the sentence.

Ex Output:

3