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 brown and white cat laying on blanket on door of open oven'. How many words start with the letter 'o' in the sentence.

Output: 5


Input: Consider Input: Sentence: 'a skateboarder doing a trick at a skate park'. How many words start with the letter 'a' in the sentence.

Output: 4


Input: Consider Input: Sentence: 'a man in a cap shorts and a shirt sitting in a boat on the water'. How many words start with the letter 'i' in the sentence.


Output: 2