TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a bird on a tree is flapping its wings'. Find frequency of the letter 'o'

SOLUTION: 1

PROBLEM: Sentence: 'two bigger elephants standing with a small elephant'. Find frequency of the letter 't'

SOLUTION: 5

PROBLEM: Sentence: 'a wooden table that has some win and glasses on it'. Find frequency of the letter 'e'

SOLUTION:
4