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

Input: Consider Input: Sentence: 'a woman is snowboarding down a snowy hill'. Replace the letter 'l' with 'b' in the sentence.

Output: a woman is snowboarding down a snowy hibb


Input: Consider Input: Sentence: 'a person who is looking at their cell phone'. Replace the letter 'o' with 'b' in the sentence.

Output: a persbn whb is lbbking at their cell phbne


Input: Consider Input: Sentence: 'a horse is standing in the grass behind a fence'. Replace the letter 'n' with 'f' in the sentence.


Output: a horse is stafdifg if the grass behifd a fefce