TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'two men in black wet suits beside a white surfboard'. Find frequency of the letter 'e'

SOLUTION: 5

PROBLEM: Sentence: 'a woman is taking a sip of a drink from a glass'. Find frequency of the letter 'i'

SOLUTION: 4

PROBLEM: Sentence: 'small bedroom with a bed, lamp, dresser, and a small chair'. Find frequency of the letter 'n'

SOLUTION:
1