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

Ex Input:
Sentence: 'a fresh flower on a table in a piture of water'. How many words contain the letter 'n' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'trash cans and a fire hydrant are on the curb of a sidewalk'. How many words contain the letter 'u' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a bathroom has a sink and shower with a frosted shower door'. How many words contain the letter 'l' in the sentence.

Ex Output:

0