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.

Ex Input:
Sentence: 'woman sitting at top of stairs talking on phone and smoking a cigarette'. How many words start with the letter 's' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a sandwich vegetables and a beer sitting on a table'. How many words start with the letter 'a' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'a double wood table in a cluttered room with a plant in the middle of the table'. How many words start with the letter 'a' in the sentence.

Ex Output:

3