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: 'the inside of a toilet stall on an airplane'. How many words start with the letter 'a' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a large group of motorcyclists waiting in the street'. How many words start with the letter 'g' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a woman with her head lowered cuddling a stuffed animal'. How many words start with the letter 'w' in the sentence.


Output: 2