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

Ex Input:
Sentence: 'a train on the side of a road on the edge of the water'. How many words contain the letter 'u' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a young person flying through the air while riding a skateboard'. How many words contain the letter 'd' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a child riding waves on a surf board'. How many words contain the letter 'q' in the sentence.

Ex Output:

0