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: 'two men are riding horses on a beach'. How many words start with the letter 'r' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a guy squatting down and tapping his food with a woman sitting down'. How many words start with the letter 'f' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a car mirror reflecting a row of cars and a train passing bye in front'. How many words start with the letter 'a' in the sentence.


Output: 4