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 person on a snowboard on a snowy day'. How many words start with the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a cake in the shape of a nurses hat written with the words congratulations danielle'. How many words start with the letter 'n' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a table is decorated with an oscar wine glasses and a vase with pink flowers'. How many words start with the letter 'a' in the sentence.

Ex Output:

4