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

Input: Consider Input: Sentence: 'there is a person awaiting to cross this street'. How many words contain the letter 'a' in the sentence.

Output: 2

Input: Consider Input: Sentence: 'a modern looking bathroom has a toilet and a sink'. How many words contain the letter 'o' in the sentence.

Output: 4

Input: Consider Input: Sentence: 'a woman is cutting a cake with a knife'. How many words contain the letter 'm' in the sentence.
Output: 1