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: 'a man working on a small laptop on a wooden table'. Find frequency of the letter 'l'

SOLUTION: 4

PROBLEM: Sentence: 'some sheep that are walking in a field'. Find frequency of the letter 'p'

SOLUTION:
1