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: 'ostrich in enclosed area next to a giraffe'. How many words start with the letter 't' in the sentence.
Example Output: 1

Example Input: Sentence: 'an older airplane flies over the country side'. How many words start with the letter 'o' in the sentence.
Example Output: 2

Example Input: Sentence: 'man holding a fork getting ready to eat something'. How many words start with the letter 'g' in the sentence.
Example Output:
1