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

Ex Input:
Sentence: 'bus with sheep decals in foreign language and doughnuts'. Replace the letter 'g' with 'i' in the sentence.

Ex Output:
bus with sheep decals in foreiin laniuaie and douihnuts

Ex Input:
Sentence: 'a white plate topped with a cut in half sandwich'. Replace the letter 'o' with 'x' in the sentence.

Ex Output:
a white plate txpped with a cut in half sandwich

Ex Input:
Sentence: 'a yellow, blue, and purple train passes on the tracks'. Replace the letter 'a' with 'n' in the sentence.

Ex Output:
n yellow, blue, nnd purple trnin pnsses on the trncks