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: 'several white boats are anchored at a marina'. How many words start with the letter 's' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a woman sitting on some stairs by a ball and backpack'. How many words start with the letter 'b' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a small white bird standing on a beach while pecking at the water'. How many words start with the letter 'a' in the sentence.


Output: 3