TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'some food on plates next to each other on a table'. Find frequency of the letter 'e'

SOLUTION: 6

PROBLEM: Sentence: 'a yellow fire hydrant in the forefront of a roadway'. Find frequency of the letter 'r'

SOLUTION: 5

PROBLEM: Sentence: 'four people on a ski lift going up a mountain'. Find frequency of the letter 'p'

SOLUTION:
3