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 colorful sculpture of an elephant in a park'. How many words start with the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'plates of different kind of food and a group of people on a picnic table'. How many words start with the letter 't' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a metal vase of flowers on top of a counter'. How many words start with the letter 'o' in the sentence.

Ex Output:

3