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Coding Problem: Based on Caesar Cypher

This a coding problem based on Caesar Cypher(or Cipher). Caesar Cipher Technique is a simple and easy method of encryption. It is a simple type of substitution cipher in which each letter of plain text is replaced by a letter with some fixed number of positions down with alphabet. This is used in a way:

Given:
a=z 
b=y
............ z=a

For example:
Input: abc
Output should Be:  zyx

Code:

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