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 man is sitting on his motorcycle outside'. How many words start with the letter 'o' in the sentence.
Example Output: 2

Example Input: Sentence: 'there is a man playing in a game of tennis'. How many words start with the letter 'i' in the sentence.
Example Output: 2

Example Input: Sentence: 'young woman sits on a surfboard in the ocean'. How many words start with the letter 't' in the sentence.
Example Output:
1