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 heard of sheep are grazing on the land'. How many words start with the letter 't' in the sentence.
Example Output: 1

Example Input: Sentence: 'group of zebras and gazelles grazing on the grass'. How many words start with the letter 'g' in the sentence.
Example Output: 4

Example Input: Sentence: 'candles are added to a celebration dessert on an important occasion'. How many words start with the letter 'i' in the sentence.
Example Output:
1