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

Ex Input:
Sentence: 'four people are playing an interesting game in the park'. Replace the letter 'e' with 'x' in the sentence.

Ex Output:
four pxoplx arx playing an intxrxsting gamx in thx park


Ex Input:
Sentence: 'children trying little hamburgers from a tray at school'. Replace the letter 'y' with 'l' in the sentence.

Ex Output:
children trling little hamburgers from a tral at school


Ex Input:
Sentence: 'several athletes are watching a game take place'. Replace the letter 'i' with 'u' in the sentence.

Ex Output:

several athletes are watchung a game take place