In this task, you need to count the number of times the given letter appears in the given sentence.

Q: Sentence: 'a young boy bouncing a tennis ball on a tennis racquet'. Find frequency of the letter 'a'

A: 5
****
Q: Sentence: 'young boy flying kite in large field at outdoor event'. Find frequency of the letter 'y'

A: 3
****
Q: Sentence: 'a man catching an orange frisbee in his hand'. Find frequency of the letter 'm'

A:
1
****