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

Ex Input:
Sentence: 'an old rusty car sits outside of an old building'. Replace the letter 'o' with 'r' in the sentence.

Ex Output:
an rld rusty car sits rutside rf an rld building


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 man goes to catch a frisbee under his leg'. Replace the letter 'n' with 's' in the sentence.

Ex Output:

a mas goes to catch a frisbee usder his leg