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 man holding a white frisbee while standing on top of a  beach'. How many words start with the letter 'o' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'some cars in the road and a street light with a red light'. How many words start with the letter 't' in the sentence.


Output: 1