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: 'some black birds sitting on some rocks and some water'. How many words start with the letter 'b' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a light shines on five clocks showing times in different zones'. How many words start with the letter 'f' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a beverage and some food are sitting on a wooden table'. How many words start with the letter 's' in the sentence.


Output: 2