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 large bathroom with double sinks and a walk in shower'. How many words start with the letter 'a' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a close up of a traffic light on a city street'. How many words start with the letter 'a' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a man laying in bed next to an open laptop computer'. How many words start with the letter 'n' in the sentence.


Output: 1