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 close up of three older men standing near one another'. How many words start with the letter 'a' in the sentence.

Ex Output:
2


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 kitchen is shown with a sink and oven'. How many words start with the letter 's' in the sentence.

Ex Output:

2