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

Example Input: Sentence: 'the airplane is parked on the runway for people to look at'. Replace the letter 'a' with 'e' in the sentence.
Example Output: the eirplene is perked on the runwey for people to look et

Example Input: Sentence: 'a giraffe sticks its tongue out in the air'. Replace the letter 'e' with 'l' in the sentence.
Example Output: a giraffl sticks its tongul out in thl air

Example Input: Sentence: 'a lady and a girl are doing the dishes together'. Replace the letter 'd' with 'o' in the sentence.
Example Output:
a laoy ano a girl are ooing the oishes together