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 door is closed with a sign on it glass cover'. How many words start with the letter 'a' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'young lady sitting on a bicycle rickshaw talking on the phone'. How many words start with the letter 's' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'an office with computer screens a laptop printer and other office accessories'. How many words start with the letter 'a' in the sentence.


Output: 4