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 man covers his ears with his hands as he stands outside a store'. How many words start with the letter 'a' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a zeppelin flying in the air as a water spouts occurs in a city lake'. How many words start with the letter 'a' in the sentence.

Output: 5


Input: Consider Input: Sentence: 'a high speed train pulls into a covered station'. How many words start with the letter 'a' in the sentence.


Output: 2