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.

Example Input: Sentence: 'a large body of water with a boat on it'. How many words start with the letter 'o' in the sentence.
Example Output: 2

Example Input: Sentence: 'a plate with potato pancakes and a fork'. How many words start with the letter 'p' in the sentence.
Example Output: 3

Example Input: Sentence: 'two men in suits kissing each other on the lips'. How many words start with the letter 'i' in the sentence.
Example Output:
1