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

Input: Consider Input: Sentence: 'a tennis player throwing a ball at the ground'. Replace the letter 'r' with 'f' in the sentence.

Output: a tennis playef thfowing a ball at the gfound


Input: Consider Input: Sentence: 'a couple of giraffe standing next to each other'. Replace the letter 't' with 'c' in the sentence.

Output: a couple of giraffe scanding nexc co each ocher


Input: Consider Input: Sentence: 'a castle wall with a clock tower with a black and gold clock'. Replace the letter 'a' with 'd' in the sentence.


Output: d cdstle wdll with d clock tower with d bldck dnd gold clock