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 riding on top of a wave on a surfboard'. How many words start with the letter 'o' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a person on skis goes across a snowy slope'. How many words start with the letter 'a' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a toilet sitting in a restroom next to a shower'. How many words start with the letter 's' in the sentence.


Output: 2