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: 'an older airplane flies over the country side'. How many words start with the letter 'o' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a man serves the ball during a claycourt tennis match'. How many words start with the letter 'm' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'two men on bicycles on the street at night'. How many words start with the letter 's' in the sentence.

Ex Output:

1