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: 'while in a restaurant a young man is playing with his phone'. How many words start with the letter 'w' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a police car driving by a construction truck'. How many words start with the letter 'b' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a white building with a red door and a bike parked outside '. How many words start with the letter 'w' in the sentence.


Output: 2