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

Ex Input:
Sentence: 'a man riding a snowboard on the side of a wall'. Replace the letter 'm' with 'p' in the sentence.

Ex Output:
a pan riding a snowboard on the side of a wall


Ex Input:
Sentence: 'a small train is on the tracks by a house'. Replace the letter 'l' with 'x' in the sentence.

Ex Output:
a smaxx train is on the tracks by a house


Ex Input:
Sentence: 'a giraffe standing in grass in a palm tree filled environment'. Replace the letter 's' with 'g' in the sentence.

Ex Output:

a giraffe gtanding in gragg in a palm tree filled environment