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 man is sitting on his motorcycle outside'. How many words start with the letter 'o' in the sentence.

Ex Output:
2


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: 'this is a girl brushing her hair with a comb'. How many words start with the letter 'w' in the sentence.

Ex Output:

1