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 holding onto a kite for a woman in the yard'. How many words start with the letter 'o' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a mother bear and her two young are crossing a shallow river'. How many words start with the letter 'a' in the sentence.

Output: 4


Input: Consider Input: Sentence: 'a tennis player is mid serve during a professional match'. How many words start with the letter 'a' in the sentence.


Output: 2