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 person sitting on a stone wall using a cellular phone'. How many words start with the letter 's' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a living room with a computer desk and a laptop'. How many words start with the letter 'l' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a dog on a leash sniffs a fire hydrant'. How many words start with the letter 'a' in the sentence.


Output: 3