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: 'a living room with a computer desk and a laptop'. How many words start with the letter 'l' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a picture of a zebra that is walking in the grass'. How many words start with the letter 'z' in the sentence.

Ex Output:
1


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