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

Sentence: 'a zebra is eating hay in a fenced enclosure'. Replace the letter 'e' with 'i' in the sentence.
a zibra is iating hay in a fincid inclosuri

Sentence: 'little tubs of rice and mixed vegetables for a meal'. Replace the letter 't' with 'z' in the sentence.
lizzle zubs of rice and mixed vegezables for a meal

Sentence: 'many clocks on a stair way with many people walking up and down them'. Replace the letter 'h' with 'n' in the sentence.

many clocks on a stair way witn many people walking up and down tnem