Substring Replacement

Replace all non-overlapping occurrences of a given substring within a string with another substring. Your task is to read the original string, the target substring, and the replacement substring, then output the modified string. Input Format: - The first line contains the original string. - The second line contains the target substring. - The third line contains the replacement substring. Output Format: - The modified string after replacement. Example: Input: Hello World World Earth Output: Hello Earth