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: 'some nice decorations left on a window pane'. How many words start with the letter 'l' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a brown teddy bear is sitting on plaid sheets'. How many words start with the letter 'p' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'several children running down a field after a soccer ball'. How many words start with the letter 'a' in the sentence.

Ex Output:

3