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

Ex Input:
Sentence: 'an orange cat laying on top of a wooden table'. How many words contain the letter 'l' in the sentence.

Ex Output:
2

Ex Input:
Sentence: 'a train on the side of a road on the edge of the water'. How many words contain the letter 'u' in the sentence.

Ex Output:
0

Ex Input:
Sentence: 'a group of people waiting along side a train track for a train'. How many words contain the letter 'f' in the sentence.

Ex Output:
2