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

Ex Input:
Sentence: 'man and woman wearing all red standing in a snowy field'. How many words contain the letter 'k' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a pile of stuffed brown teddy bears wearing clothing'. How many words contain the letter 'w' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'an australian shepherd dog catches a pink frisbee in the park'. How many words contain the letter 'f' in the sentence.

Ex Output:

1