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: 'three black bears on or around a wooden play structure'. How many words start with the letter 's' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a bed with a wooden chest of drawers on it'. How many words start with the letter 'o' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a man riding skis across snow covered ground'. How many words start with the letter 'a' in the sentence.

Ex Output:

2