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 shot of the tops of several tall buildings in a city'. How many words start with the letter 'a' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a bathroom sink and mirror with someone personal belongings on it'. How many words start with the letter 'p' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'an open water channel between two rows of parked boats'. How many words start with the letter 'o' in the sentence.


Output: 2