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 street with a stoplight and google street sign'. How many words start with the letter 'a' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'two grey cats laying in an open black suitcase'. How many words start with the letter 'b' in the sentence.


Output: 1