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

Example Input: Sentence: 'a couple of giraffe standing next to each other'. Replace the letter 't' with 'c' in the sentence.
Example Output: a couple of giraffe scanding nexc co each ocher

Example Input: Sentence: 'a bowl filled with vegetables and noodles on a table'. Replace the letter 'l' with 'r' in the sentence.
Example Output: a bowr firred with vegetabres and noodres on a tabre

Example Input: Sentence: 'a red passenger train traveling through wilderness and country'. Replace the letter 'e' with 'r' in the sentence.
Example Output:
a rrd passrngrr train travrling through wildrrnrss and country