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: 'group of kids play frisbee golf in the middle of the woods'. How many words contain the letter 't' in the sentence.

Ex Output:
2

Ex Input:
Sentence: 'a little vehicle with open doors on each side and a ladder on the back'. How many words contain the letter 'u' in the sentence.

Ex Output:
0