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 man cuts into food being cooked on a grill'. How many words start with the letter 'o' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a batter lifts his left foot as he swings the bat'. How many words start with the letter 'a' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'two people sit on a motorcycle next to others standing near'. How many words start with the letter 's' in the sentence.

Ex Output:

2