TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'people waiting on a train platform in a wooded area'. Find frequency of the letter 'p'

SOLUTION: 3

PROBLEM: Sentence: 'a man using a video game controller in a room'. Find frequency of the letter 'n'

SOLUTION: 4

PROBLEM: Sentence: 'two people on skis standing in the snow'. Find frequency of the letter 't'

SOLUTION:
3