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

Input: Consider Input: Sentence: 'a open entrance leading to a set of closed doors'. Replace the letter 'd' with 'f' in the sentence.

Output: a open entrance leafing to a set of closef foors

Input: Consider Input: Sentence: 'a pizza sitting on top of a metal pizza pan'. Replace the letter 'p' with 't' in the sentence.

Output: a tizza sitting on tot of a metal tizza tan

Input: Consider Input: Sentence: 'a very big building and some plastic glasses'. Replace the letter 'l' with 'n' in the sentence.
Output: a very big buinding and some pnastic gnasses