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 boy in a red baseball uniform throws a ball'. How many words start with the letter 'b' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'two adults and a child fly a kite at the beach'. How many words start with the letter 'a' in the sentence.

Output: 5


Input: Consider Input: Sentence: 'a baseball player is getting ready to hit the ball'. How many words start with the letter 'r' in the sentence.


Output: 1