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

Ex Input:
Sentence: 'the children are playing on the beach  next to the water'. How many words contain the letter 'h' in the sentence.

Ex Output:
5


Ex Input:
Sentence: 'an elephant standing on a green grass area'. How many words contain the letter 'm' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a man in a photo studio under lights with a background'. How many words contain the letter 'k' in the sentence.

Ex Output:

1