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: 'mounds of plantains are on display at market stalls'. How many words start with the letter 'm' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'decorative objects on a counter in front of a framed picture'. How many words start with the letter 'o' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'serveral cows behind barbed wire in a field'. How many words start with the letter 'b' in the sentence.

Ex Output:

2