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 holding onto a kite for a woman in the yard'. How many words start with the letter 'o' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'the inside of a toilet stall on an airplane'. How many words start with the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a man and a woman looking at something in a kitchen'. How many words start with the letter 'a' in the sentence.

Ex Output:

5