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

Q: Sentence: 'older man getting ready to swing his bat at a ball on a stand in front of a group of viewers'. Find frequency of the letter 'n'

A: 7
****
Q: Sentence: 'a man standing on a tennis court holding a racquet'. Find frequency of the letter 's'

A: 2
****
Q: Sentence: 'a male snowboarder in a black jacket'. Find frequency of the letter 'r'

A:
2
****