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 hydrant is sitting outside in the dirt'. How many words start with the letter 'i' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a tall zebra grazing on a lush green field'. How many words start with the letter 't' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a large long bus on a city road'. How many words start with the letter 'r' in the sentence.

Ex Output:

1