TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a room with a bed, lamps, tables and pillows'. Replace the letter 's' with 'b' in the sentence.

SOLUTION: a room with a bed, lampb, tableb and pillowb

PROBLEM: Sentence: 'a gray elephant standing next to green bushes'. Replace the letter 'e' with 'o' in the sentence.

SOLUTION: a gray olophant standing noxt to groon bushos

PROBLEM: Sentence: 'a couple of giraffe standing next to each other'. Replace the letter 'e' with 'g' in the sentence.

SOLUTION:
a couplg of giraffg standing ngxt to gach othgr