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 girl and her dog walk past a bike'. How many words start with the letter 'a' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a zebra walking past a  rhino in dirt'. How many words start with the letter 'd' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a close up of a child cutting paper with scissors'. How many words start with the letter 'u' in the sentence.


Output: 1