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

Sentence: 'a couple of giraffe standing next to each other'. Replace the letter 'i' with 'q' in the sentence.
a couple of gqraffe standqng next to each other

Sentence: 'the cargo train is headed to the next destination'. Replace the letter 'h' with 'x' in the sentence.
txe cargo train is xeaded to txe next destination

Sentence: 'a dessert that looks like it would be served at an elegant restaurant'. Replace the letter 't' with 'r' in the sentence.

a desserr rhar looks like ir would be served ar an eleganr resrauranr