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

Ex Input:
Sentence: 'a man is standing with this luggage next to a railroad track'. Replace the letter 'g' with 'l' in the sentence.

Ex Output:
a man is standinl with this lullale next to a railroad track


Ex Input:
Sentence: 'the big sandwich features several different  colorful ingredients'. Replace the letter 'e' with 'o' in the sentence.

Ex Output:
tho big sandwich foaturos sovoral difforont  colorful ingrodionts


Ex Input:
Sentence: 'a blender sitting next to a field full of grass'. Replace the letter 't' with 'n' in the sentence.

Ex Output:

a blender sinning nexn no a field full of grass