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

Ex Input:
Sentence: 'a blue traffic sign next to a parked car on a city street'. How many words contain the letter 'g' in the sentence.

Ex Output:
1


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 sign show that there is danger ahead'. How many words contain the letter 'a' in the sentence.

Ex Output:

4