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

Input: Consider Input: Sentence: 'child standing in front of a stop sign on a suburban street corner'. How many words contain the letter 'u' in the sentence.

Output: 1

Input: Consider Input: Sentence: 'a large clock tower under a grey cloudy sky'. How many words contain the letter 'l' in the sentence.

Output: 3

Input: Consider Input: Sentence: 'a man is surfing on a board in the water'. How many words contain the letter 'g' in the sentence.
Output: 1