instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a group of small children sitting at a table in front of a pizza'. Replace the letter 'r' with 'd' in the sentence.
answer:
a gdoup of small childden sitting at a table in fdont of a pizza


question:
Sentence: 'busy city street with pedestrians and cars with lights all around'. Replace the letter 'r' with 'k' in the sentence.
answer:
busy city stkeet with pedestkians and caks with lights all akound


question:
Sentence: 'people waiting for a train in a train terminal'. Replace the letter 't' with 'i' in the sentence.
answer:

people waiiing for a irain in a irain ierminal