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 person standing on a green field next to a river flying a kite'. How many words start with the letter 'a' in the sentence.

Output: 4


Input: Consider Input: Sentence: 'a man riding a skateboard at a skate park'. How many words start with the letter 'r' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a man in a black wetsuit laying on a surfboard'. How many words start with the letter 'l' in the sentence.


Output: 1