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 person walking on a street with a umbrella'. How many words start with the letter 's' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a couple of kids are sitting in the grass'. How many words start with the letter 'a' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a sandwich on a cutting board and a glass of wine'. How many words start with the letter 'o' in the sentence.


Output: 2