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: 'some very pretty giraffes standing by a big fence'. How many words start with the letter 'f' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a girl holds her racket up while playing tennis'. How many words start with the letter 'w' in the sentence.


Output: 1