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

Ex Input:
Sentence: 'a man and woman holding electronic devices in their hands'. How many words contain the letter 'e' in the sentence.

Ex Output:
3


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: 'an adult polar bear with two small cubs'. How many words contain the letter 'u' in the sentence.

Ex Output:

2