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

Ex Input:
Sentence: 'adults with helmets sitting on tricycles made for children'. How many words contain the letter 'r' in the sentence.

Ex Output:
3

Ex Input:
Sentence: 'a pizza with sauce cheese and sausage sitting on a table'. How many words contain the letter 's' in the sentence.

Ex Output:
4

Ex Input:
Sentence: 'commercial planes of all shapes and sizes landing and taking off at the airport'. How many words contain the letter 'd' in the sentence.

Ex Output:
3