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

Sentence: 'there is a stepladder situated over a toilet'. Replace the letter 'r' with 'x' in the sentence.
thexe is a stepladdex situated ovex a toilet

Sentence: 'two police officers riding horses down the street'. Replace the letter 'o' with 'd' in the sentence.
twd pdlice dfficers riding hdrses ddwn the street

Sentence: 'a large bear is standing over by the rocks'. Replace the letter 'e' with 'h' in the sentence.

a largh bhar is standing ovhr by thh rocks