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: 'old junked blue truck in a field between two dead trees'. How many words start with the letter 't' in the sentence.
Example Output: 3

Example Input: Sentence: 'a man who is holding some food near his mouth'. How many words start with the letter 'f' in the sentence.
Example Output: 1

Example Input: Sentence: 'two black and white cows resting on grass'. How many words start with the letter 'g' in the sentence.
Example Output:
1