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

Ex Input:
Sentence: 'there are peoople standign next to a bike'. Replace the letter 'o' with 't' in the sentence.

Ex Output:
there are pettple standign next tt a bike

Ex Input:
Sentence: 'a white bathroom with a stand alone sink and a shower curtain'. Replace the letter 'a' with 'm' in the sentence.

Ex Output:
m white bmthroom with m stmnd mlone sink mnd m shower curtmin

Ex Input:
Sentence: 'a giraffe is standing looking at something at there den'. Replace the letter 'n' with 'o' in the sentence.

Ex Output:
a giraffe is staodiog lookiog at somethiog at there deo