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: 'there is a very large table with many foods and people sitting at it'. How many words start with the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a clock tower in front of a dark sky'. How many words start with the letter 'f' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'television with screen on and open laptop with writing on screen'. How many words start with the letter 'o' in the sentence.

Ex Output:

3