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

Input: Consider Input: Sentence: 'there are some warning signs on a public toilet'. How many words contain the letter 'a' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a grey cat sitting in a metal kitchen sink next to cans of soda'. How many words contain the letter 't' in the sentence.

Output: 6


Input: Consider Input: Sentence: 'a box with a pair of scissors stuck in the top of it'. How many words contain the letter 'o' in the sentence.


Output: 5