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

Ex Input:
Sentence: 'a airplane is seen at the airport with other airplanes'. How many words contain the letter 'z' in the sentence.

Ex Output:
0


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: 'the banana is on the desk beside the calculator'. How many words contain the letter 'o' in the sentence.

Ex Output:

2