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

Input: Consider Input: Sentence: 'an untidy room with clothes bottles next to an oven'. How many words contain the letter 'a' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a close up of two people wearing ties'. How many words contain the letter 'o' in the sentence.

Output: 4


Input: Consider Input: Sentence: 'a rooster on the ground has a bright red comb'. How many words contain the letter 'r' in the sentence.


Output: 4