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

Ex Input:
Sentence: 'a dog wearing a hat on top of it's head'. Replace the letter 'g' with 'o' in the sentence.

Ex Output:
a doo wearino a hat on top of it's head

Ex Input:
Sentence: 'a bride and a groom look ridiculous as they stuff cake into each other's mouth'. Replace the letter 'd' with 's' in the sentence.

Ex Output:
a brise ans a groom look risiculous as they stuff cake into each other's mouth

Ex Input:
Sentence: 'giraffes are standing in the dirt by grass and trees'. Replace the letter 'r' with 'g' in the sentence.

Ex Output:
gigaffes age standing in the digt by ggass and tgees