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 guy preforming a skateboard trick at a skate park'. How many words start with the letter 'a' in the sentence.

Output: 4


Input: Consider Input: Sentence: 'a brown dog sitting next to a brown cat on a bed'. How many words start with the letter 'a' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a man and three children playing with a kite on the grass and other people riding bikes on a nearby road'. How many words start with the letter 'a' in the sentence.


Output: 5