TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a family out snow skiing on a blustery day'. Find frequency of the letter 'i'

SOLUTION: 3

PROBLEM: Sentence: 'many white birds flying above a river that flows in front of a forest'. Find frequency of the letter 'a'

SOLUTION: 5

PROBLEM: Sentence: 'a group of zebras are standing in a clearing with a young zebra beside the mother'. Find frequency of the letter 'n'

SOLUTION:
5