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 living room with hd tv chair and decorations'. How many words start with the letter 'r' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'this is a living room table with several large chairs placed around it'. How many words start with the letter 'a' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a white delta airlines plane at an airport'. How many words start with the letter 'a' in the sentence.

Ex Output:

5