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

Ex Input:
Sentence: 'a person in uniform is on a motorcycle near other uniformed people'. How many words contain the letter 'r' in the sentence.

Ex Output:
6


Ex Input:
Sentence: 'a pile of stuffed brown teddy bears wearing clothing'. How many words contain the letter 'w' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a lady and a child near a park bench with kites and ducks flying in the sky and on the ground'. How many words contain the letter 'o' in the sentence.

Ex Output:

2