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: 'two men on motorcycles and wearing helmets'. How many words start with the letter 'w' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a kitchen scene complete with a refrigerator sink and oven'. How many words start with the letter 's' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a person posing with massacres on and a tie'. How many words start with the letter 'p' in the sentence.

Ex Output:

2