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 person is kite surfing on calm water while it is cloudy'. How many words start with the letter 'k' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a white glass vase filled with flowers on top of a table'. How many words start with the letter 'o' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a zebra standing next to a rock cave next to a pile of rocks'. How many words start with the letter 'a' in the sentence.


Output: 3