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 giraffe is standing behind a stone wall'. How many words start with the letter 'a' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a lone zebra standing in the middle of a field'. How many words start with the letter 'i' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a woman walks in the street in the rain'. How many words start with the letter 'i' in the sentence.


Output: 2