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

Ex Input:
Sentence: 'a crowd of people flying kites near the capitol building'. How many words contain the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'there is a red tea pot that has flowers in it'. How many words contain the letter 'o' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a kitchen next to a wood floored living area'. How many words contain the letter 'g' in the sentence.

Ex Output:

1