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 lone zebra standing in the middle of a field'. How many words start with the letter 'i' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a red and white double decker bus parked in front of a building'. How many words start with the letter 'b' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'some small tanker style trucks parked on the side of the street with a group of people talking on the sidewalk'. How many words start with the letter 'o' in the sentence.


Output: 4