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.

Ex Input:
Sentence: 'dog playing frisbee on the beach with ocean in background'. How many words start with the letter 'o' in the sentence.

Ex Output:
2

Ex Input:
Sentence: 'parking meter with nine minutes left and red car'. How many words start with the letter 'c' in the sentence.

Ex Output:
1

Ex Input:
Sentence: 'this is a young woman getting ready to hit a tennis ball'. How many words start with the letter 't' in the sentence.

Ex Output:
3