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 bird is drinking out of a red dish'. How many words start with the letter 'a' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a red and white double decker bus parked in front of a building'. How many words start with the letter 'b' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a clock tower made of stone with an ornate clock'. How many words start with the letter 'a' in the sentence.


Output: 2