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: 'the man is standing on a surfboard with a paddle'. How many words start with the letter 's' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'an airplane as it is taking off and is ascending into space'. How many words start with the letter 'a' in the sentence.

Output: 5


Input: Consider Input: Sentence: 'a bird stands on the top of rocks'. How many words start with the letter 'o' in the sentence.


Output: 2