TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a stop sign near a rail road crossing sign'. Find frequency of the letter 'g'

SOLUTION: 3

PROBLEM: Sentence: 'a woman walking with a child that is in a wheelchair'. Find frequency of the letter 'k'

SOLUTION: 1

PROBLEM: Sentence: 'a person standing in a field holding a kite'. Find frequency of the letter 'i'

SOLUTION:
5