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

Sentence: 'a woman standing in front of a bear in an enclosure'. Replace the letter 'e' with 'r' in the sentence.
a woman standing in front of a brar in an rnclosurr

Sentence: 'a blue and white train is coming down some tracks'. Replace the letter 'b' with 'u' in the sentence.
a ulue and white train is coming down some tracks

Sentence: 'a refrigerator that is packed with a lot of drinks'. Replace the letter 's' with 'q' in the sentence.
a refrigerator that iq packed with a lot of drinkq