1311. Find XOR of Digits of a Number

Given a non-negative integer n, return the XOR of its decimal digits.

Input: A JSON object {"n": <non-negative integer>}.

Output: Return the XOR of all decimal digits of n.

Examples

Example 1

Input: {"n":1234}
Output: 4
Explanation: 1^2^3^4 = 4.

Example 2

Input: {"n":77}
Output: 0
Explanation: 7^7 = 0.