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

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 hipster riding a skateboard up the side of a wall'. Replace the letter 's' with 'm' in the sentence.

Ex Output:
a hipmter riding a mkateboard up the mide of a wall


Ex Input:
Sentence: 'a set of directional signs pointing towards some caves and falls'. Replace the letter 'p' with 'l' in the sentence.

Ex Output:

a set of directional signs lointing towards some caves and falls