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

Ex Input:
Sentence: 'a woman on a cell phone on  city street'. Replace the letter 'e' with 'a' in the sentence.

Ex Output:
a woman on a call phona on  city straat


Ex Input:
Sentence: 'a photo of a river with a train bridge across it'. Replace the letter 'r' with 'f' in the sentence.

Ex Output:
a photo of a fivef with a tfain bfidge acfoss it


Ex Input:
Sentence: 'the clock says ten pm on a red glowing screen'. Replace the letter 'k' with 'd' in the sentence.

Ex Output:

the clocd says ten pm on a red glowing screen