In this task, you need to replace a letter in the sentence with another given letter.

[Q]: Sentence: 'a photo of a river with a train bridge across it'. Replace the letter 'r' with 'f' in the sentence.
[A]: a photo of a fivef with a tfain bfidge acfoss it

[Q]: Sentence: 'a clock mounted above a door entrance with windows'. Replace the letter 's' with 'l' in the sentence.
[A]: a clock mounted above a door entrance with windowl

[Q]: Sentence: 'two black birds sitting on top of some standing upright logs'. Replace the letter 't' with 'r' in the sentence.
[A]:
rwo black birds sirring on rop of some sranding uprighr logs