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.
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
The program prints to standard output a single non-negative integer: the smallest palindrome `p` satisfying `p >= n`, followed by a newline.
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