TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a man in a black shirt prepares to catch a frisbee'. Find frequency of the letter 'f'

SOLUTION: 1

PROBLEM: Sentence: 'a downhill skier with snow plumes behind them'. Find frequency of the letter 'i'

SOLUTION: 4

PROBLEM: Sentence: 'a man is looking up while another man is peeking over his shoulder'. Find frequency of the letter 'e'

SOLUTION:
6