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

Ex Input:
Sentence: 'a group of people skiing down a mountain slope'. How many words contain the letter 'e' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'bus parked next to a side walk on the road'. How many words contain the letter 'd' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'some people are sitting in a small boat next to a dock'. How many words contain the letter 'o' in the sentence.

Ex Output:

5