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 is standing on the ledge of the building'. Find frequency of the letter 't'

SOLUTION: 3

PROBLEM: Sentence: 'a plate of food, with broccoli and nuts'. Find frequency of the letter 'b'

SOLUTION: 1

PROBLEM: Sentence: 'a woman jumps to connect with a tennis ball with spectators looking on'. Find frequency of the letter 'i'

SOLUTION:
4