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

Ex Input:
Sentence: 'a girl is ready to serve the ball on a clay court'. How many words contain the letter 'd' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a bench is in the ocean water with a fishing pole'. How many words contain the letter 'm' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a person riding skis down the side of a snow covered slope'. How many words contain the letter 'w' in the sentence.

Ex Output:

2