instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a couple of horses with carriages at a building'. Replace the letter 'u' with 'm' in the sentence.
answer:
a comple of horses with carriages at a bmilding


question:
Sentence: 'a giraffe sticks its tongue out in the air'. Replace the letter 'e' with 'l' in the sentence.
answer:
a giraffl sticks its tongul out in thl air


question:
Sentence: 'an otter playing with some freebees on a rock'. Replace the letter 'f' with 'k' in the sentence.
answer:

an otter playing with some kreebees on a rock