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: 'an orange and white scooter carrying two passengers drives down a wet street while the passenger of the scooter holds a purple umbrella'. How many words start with the letter 'a' in the sentence.

Output: 4


Input: Consider Input: Sentence: 'a man pulls a rolling suitcase and is wearing a suit'. How many words start with the letter 'a' in the sentence.

Output: 4


Input: Consider Input: Sentence: 'a young blonde drinking wine in a restaurant'. How many words start with the letter 'i' in the sentence.


Output: 1