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

Ex Input:
Sentence: 'a man is water skiing in the ocean'. How many words contain the letter 'c' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a smiling man holds out a card with color swatches'. How many words contain the letter 'i' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a train traveling down tracks through an area with lots of green trees'. How many words contain the letter 'o' in the sentence.

Ex Output:

4