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

Ex Input:
Sentence: 'a skater looks ahead as he rides down a ramp'. Replace the letter 'n' with 'm' in the sentence.

Ex Output:
a skater looks ahead as he rides dowm a ramp


Ex Input:
Sentence: 'a cat with a pink bow sits underneath something silver'. Replace the letter 'h' with 'n' in the sentence.

Ex Output:
a cat witn a pink bow sits underneatn sometning silver


Ex Input:
Sentence: 'a big bowl of brown food halfway in a small oven'. Replace the letter 'v' with 'k' in the sentence.

Ex Output:

a big bowl of brown food halfway in a small oken