TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a u.s. military helicopter landing or taking off'. Replace the letter 'i' with 'l' in the sentence.

SOLUTION: a u.s. mllltary hellcopter landlng or taklng off

PROBLEM: Sentence: 'a black and white photo of a bird clouds sand and water'. Replace the letter 'b' with 'p' in the sentence.

SOLUTION: a plack and white photo of a pird clouds sand and water

PROBLEM: Sentence: 'a old school propeller plane next to a mountain'. Replace the letter 'n' with 'v' in the sentence.

SOLUTION:
a old school propeller plave vext to a mouvtaiv