TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a gray elephant is in a grassy field'. Find frequency of the letter 'e'

SOLUTION: 3

PROBLEM: Sentence: 'a river with a long dragon boat in it and rowers on the boat in sets of two, along with two other people'. Find frequency of the letter 'h'

SOLUTION: 4

PROBLEM: Sentence: 'a young woman holding a gun on a stove top oven sitting in a field'. Find frequency of the letter 'n'

SOLUTION:
8