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 wearing a beret while using a laptop computer'. How many words start with the letter 'u' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a blue brick building with a man leaning on it'. How many words start with the letter 'b' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a blue bus at a brick sidewalk with a red car at the side'. How many words start with the letter 'a' in the sentence.

Ex Output:

5