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 very large carrot and a large knife'. How many words start with the letter 'l' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'birds are standing in a row on a wooden railing'. How many words start with the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a laptop computer sitting on a desk next to a desktop computer'. How many words start with the letter 'd' in the sentence.

Ex Output:

2