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 close up of a dog standing on a rug'. How many words start with the letter 'o' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a guy a skateboard jumping in the air'. How many words start with the letter 'a' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a large plane on an air port run way'. How many words start with the letter 'a' in the sentence.


Output: 3