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: 'some black birds sitting on some rocks and some water'. How many words start with the letter 'b' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a msall bus going down a road with a street sign'. How many words start with the letter 'd' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a toilet with controls is displayed by a sink'. How many words start with the letter 'a' in the sentence.


Output: 2