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

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

Ex Input:
Sentence: 'a large bedroom with art over the bed'. Replace the letter 'r' with 'o' in the sentence.

Ex Output:
a laoge bedooom with aot oveo the bed

Ex Input:
Sentence: 'the city bus is driving next to a cactus'. Replace the letter 's' with 'l' in the sentence.

Ex Output:
the city bul il driving next to a cactul