#include <stdio.h>
#include <string.h>
#include <ctype.h>
int ispalindrome(int n) {
    int reversed = 0, original = n;
    while (n > 0) {
        reversed = reversed * 10 + (n % 10);
        n /= 10;
    }
    return original == reversed;
}
int isvalidnumber(char str[]) {
    
}
        
    }
}