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 woman sitting on some stairs by a ball and backpack'. How many words start with the letter 'b' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'green plants growing in a garden on the ground'. How many words start with the letter 'g' in the sentence.

Output: 4


Input: Consider Input: Sentence: 'a boy wearing glasses and a red tie'. How many words start with the letter 'b' in the sentence.


Output: 1