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

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 stuffed animal yellow giraffe placed next to a sandwich as if the giraffe is eating it with a large body of water and grass areas in the background'. How many words contain the letter 'g' in the sentence.

Ex Output:
6


Ex Input:
Sentence: 'a white vase filled with yellow and purple flowers'. How many words contain the letter 'r' in the sentence.

Ex Output:

2