TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a small bird perched on some thin branches'. Replace the letter 'a' with 'f' in the sentence.

SOLUTION: f smfll bird perched on some thin brfnches

PROBLEM: Sentence: 'a toddler on skis being held up by a grownup'. Replace the letter 'o' with 'k' in the sentence.

SOLUTION: a tkddler kn skis being held up by a grkwnup

PROBLEM: Sentence: 'two women are playing around with their digital cameras'. Replace the letter 'e' with 'w' in the sentence.

SOLUTION:
two womwn arw playing around with thwir digital camwras