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 passanger train is coming down the tracks'. How many words start with the letter 't' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a young man with a laptop bag travels on a skateboard'. How many words start with the letter 'b' in the sentence.


Output: 1