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

Example Input: Sentence: 'a person is looking out of a large window'. Replace the letter 'o' with 'p' in the sentence.
Example Output: a perspn is lppking put pf a large windpw

Example Input: Sentence: 'a man and a child skiing down a mountain on a trail'. Replace the letter 'n' with 'm' in the sentence.
Example Output: a mam amd a child skiimg dowm a moumtaim om a trail

Example Input: Sentence: 'a woman in a zebra print shirt standing in front of a farmers market'. Replace the letter 'i' with 'p' in the sentence.
Example Output:
a woman pn a zebra prpnt shprt standpng pn front of a farmers market