In this task, you need to count the number of words in a sentence that start with the given letter. Answer with numbers and not words.

Input: Consider Input: Sentence: 'a black and white photo of a man in the street feeding cats and dogs'. How many words start with the letter 'a' in the sentence.

Output: 4


Input: Consider Input: Sentence: 'a cat is laying on a keyboard in front of double monitors'. How many words start with the letter 'm' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a man and a woman cutting a cake together'. How many words start with the letter 'a' in the sentence.


Output: 4