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 lady has just about finished her plate with a knife'. How many words start with the letter 'a' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a picture of a zebra that is walking in the grass'. How many words start with the letter 'z' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'group of people standing around watching a black howie'. How many words start with the letter 'b' in the sentence.


Output: 1