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 yellow grey and white bird on a small group of twigs'. How many words start with the letter 'b' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a person leans back while holding onto a flying object'. How many words start with the letter 'a' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a man in a red shirt in midair catching a flying disc'. How many words start with the letter 'c' in the sentence.


Output: 1