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 and three children playing with a kite on the grass and other people riding bikes on a nearby road'. How many words start with the letter 'a' in the sentence.

Ex Output:
5


Ex Input:
Sentence: 'an elephant standing in front of some trees with its trunk in the air'. How many words start with the letter 's' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a man looking up holding a phone in his hand'. How many words start with the letter 'h' in the sentence.

Ex Output:

3