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

Ex Input:
Sentence: 'a woman in a wheelchair is about to play tennis'. How many words contain the letter 'r' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a man using an outdoor oven to cook a pizza'. How many words contain the letter 'f' in the sentence.

Ex Output:
0


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