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 blue bench a house and some bushes'. How many words start with the letter 'b' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a photograph of a vase through its glass showcase'. How many words start with the letter 'i' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'four young people are sitting on a bed with lap tops'. How many words start with the letter 's' in the sentence.


Output: 1