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 man and luggage carts outside of an airplane'. How many words start with the letter 'o' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a variety of vegetables meat cheese and eggs on a cutting board'. How many words start with the letter 'a' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a man in trunks carrying his yellow surfboard'. How many words start with the letter 'a' in the sentence.


Output: 1