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

Input: Consider Input: Sentence: 'a polar bear relaxing in a man-made pool'. Replace the letter 'r' with 'x' in the sentence.

Output: a polax beax xelaxing in a man-made pool


Input: Consider Input: Sentence: 'a well dressed man standing near his early bicycle'. Replace the letter 'e' with 'd' in the sentence.

Output: a wdll drdssdd man standing ndar his darly bicycld


Input: Consider Input: Sentence: 'a long green grain traveling past a white building'. Replace the letter 'w' with 'o' in the sentence.


Output: a long green grain traveling past a ohite building