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

Ex Input:
Sentence: 'a plate has many different types of food on it'. How many words contain the letter 'r' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'two men are dancing in a parade with brown umbrellas'. How many words contain the letter 'r' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'a group of elephants surrounded by some trees'. How many words contain the letter 'l' in the sentence.

Ex Output:

1