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Problem
A non-negative integer is a palindrome if its decimal representation read from left to right equals its representation read from right to left (for example, `121`, `7`, `1331`, `0`).
Read a non-negative integer `n` and print the smallest palindrome greater than or equal to `n`.
Input format
Input
input.txt
The program reads from standard input a single non-negative integer `n`. - `0 <= n <= 1000000` - it is recommended to implement a separate function that checks whether a number is a palindrome
Output format
Output
output.txt
The program prints to standard output a single non-negative integer: the smallest palindrome `p` satisfying `p >= n`, followed by a newline.
Example
input
123
output
131
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Sample cases (from the problem)
Sample Case 1
Input
123
Expected output
131
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