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

Ex Input:
Sentence: 'the young giraffe is standing near the fence'. How many words contain the letter 's' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'the tennis player returns a serve of the tennis ball'. How many words contain the letter 'q' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a full view of a big metropolitan city'. How many words contain the letter 'b' in the sentence.

Ex Output:

1