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 talks on the cellphone outside of a building'. How many words start with the letter 'o' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a cat is laying in a bowl with a receipt'. How many words start with the letter 'a' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a herd of elephants standing on top of a grass covered field'. How many words start with the letter 'e' in the sentence.


Output: 1