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 riding skis down the side of a snow covered ski slope'. How many words start with the letter 's' in the sentence.

Output: 5


Input: Consider Input: Sentence: 'two packaged frozen pizzas that are on a cookie sheet and the boxes behind the pizzas'. How many words start with the letter 't' in the sentence.

Output: 4


Input: Consider Input: Sentence: 'a man is playing tennis on a tennis court'. How many words start with the letter 'm' in the sentence.


Output: 1