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: 'people all eating together and pretending to like each other'. How many words start with the letter 'p' in the sentence.

Ex Output:
2


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: 'man and child on a horse and carriage riding down a road'. How many words start with the letter 'a' in the sentence.

Ex Output:

4