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 baseball player swinging a bat while a catcher is behind him with his mitt out'. How many words start with the letter 'w' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a pair of snow skis and a snowboard in the snow'. How many words start with the letter 's' in the sentence.


Output: 4