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 police car driving by a construction truck'. How many words start with the letter 'b' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'two giraffes are walking down a rocky path'. How many words start with the letter 'a' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'there is a elephant that is wearing many red decorations'. How many words start with the letter 'e' in the sentence.

Ex Output:

1