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 group of young people riding snow boards down a snow covered hillside'. How many words start with the letter 'a' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'two men holding electronic devices compete in an interactive game'. How many words start with the letter 't' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a guy a skateboard jumping in the air'. How many words start with the letter 'a' in the sentence.


Output: 3