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

Sentence: 'closeup of two teddy bears in red scarves and a brown teddy bear'. Replace the letter 'i' with 'y' in the sentence.
closeup of two teddy bears yn red scarves and a brown teddy bear

Sentence: 'there is a piece of a cake on the plate and a cup of drink'. Replace the letter 'r' with 'u' in the sentence.
theue is a piece of a cake on the plate and a cup of duink

Sentence: 'a yellow and green fire hydrogen that is next to a road'. Replace the letter 'y' with 't' in the sentence.
a tellow and green fire htdrogen that is next to a road