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

Ex Input:
Sentence: 'several people sitting around a table eating pizza'. How many words contain the letter 'u' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'two angles of a frosted donut with a bite taken out of the side'. How many words contain the letter 'z' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a view of a king size bed that appear to be in a hotel'. How many words contain the letter 'n' in the sentence.

Ex Output:

2