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 plate with potato pancakes and a fork'. How many words start with the letter 'p' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a little white airplane that is parked on some concrete'. How many words start with the letter 'p' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a group of people outside holding umbrellas'. How many words start with the letter 'g' in the sentence.

Ex Output:

1