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 bed with a wooden chest of drawers on it'. How many words start with the letter 'o' in the sentence.

Ex Output:
2

Ex Input:
Sentence: 'the men are holding on to surfboards outside'. How many words start with the letter 'o' in the sentence.

Ex Output:
2

Ex Input:
Sentence: 'two lawn chairs with a bird perched on the back of one'. How many words start with the letter 'c' in the sentence.

Ex Output:
1