Replace Character Problem Statement

Given an input string S and two characters 'c1' and 'c2', your task is to replace every occurrence of the character 'c1' with the character 'c2' in the given string.

Input:

Line 1: Input String S
Line 2: Character c1 and c2 (separated by space)

Output:

Updated string

Example:

Input:

S = "hello world"
c1 = "l" c2 = "x"

Output:

"hexxo worxd"

Constraints:

• 1 <= Length of String S <= 10^6