TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a picture of a machine built next to a street'. Find frequency of the letter 'x'

SOLUTION: 1

PROBLEM: Sentence: 'a person dressed all in black snowboarding down a slope'. Find frequency of the letter 'e'

SOLUTION: 4

PROBLEM: Sentence: 'a person up in the air on a surfboard'. Find frequency of the letter 'p'

SOLUTION:
2