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 couple of people flying a kite in a field'. How many words start with the letter 'a' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a clock tower atop a tall building with a lighting rod'. How many words start with the letter 'a' in the sentence.

Output: 4


Input: Consider Input: Sentence: 'a line of two skiers and a snowboarder moving down a slope'. How many words start with the letter 's' in the sentence.


Output: 3