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: 'three motorcycle police in front of a crowd attending an outdoor summer event with beer truck behind them'. How many words start with the letter 'p' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a man riding a skateboard at a skate park'. How many words start with the letter 'r' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a man riding a skateboard in a river bed'. How many words start with the letter 'r' in the sentence.


Output: 2