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

Ex Input:
Sentence: 'people are parked along side the road by pay here signs'. How many words contain the letter 'a' in the sentence.

Ex Output:
5

Ex Input:
Sentence: 'a man walking in front of a train station'. How many words contain the letter 'o' in the sentence.

Ex Output:
3

Ex Input:
Sentence: 'a man and two boys with a dog on a motorcycle and side cart'. How many words contain the letter 'u' in the sentence.

Ex Output:
0