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: 'a u.s. military helicopter landing or taking off'. Replace the letter 'i' with 'l' in the sentence.

Ex Output:
a u.s. mllltary hellcopter landlng or taklng off


Ex Input:
Sentence: 'a red brick wall with signs posted on it'. Replace the letter 's' with 'n' in the sentence.

Ex Output:

a red brick wall with nignn ponted on it