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

Ex Input:
Sentence: 'a close up of two black cows grazing the grass'. How many words contain the letter 'u' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a man buttering toast in his kitchen on the counter'. How many words contain the letter 'c' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a brown dog is laying un the floor under peoples feet'. How many words contain the letter 'a' in the sentence.

Ex Output:

2