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 holding a brown paper bag kite'. Find frequency of the letter 'b'

SOLUTION: 2

PROBLEM: Sentence: 'two men in black wet suits beside a white surfboard'. Find frequency of the letter 'e'

SOLUTION: 5

PROBLEM: Sentence: 'a group of people snowshoeing through a snowy trail'. Find frequency of the letter 'r'

SOLUTION:
3