#include <stdio.h>
#include <string.h>
#include <ctype.h>
int isPalindrome(int num) {
    int reversed = 0, original = num, remainder;

    while (num != 0) {
        remainder = num % 10;
        reversed = reversed * 10 + remainder;
        num /= 10;
    }

    return original == reversed;
}
int isNumeric(char str[]) {
    for (int i = 0; str[i]; i++) {
        if (!isdigit(str[i])) {
            return 0;
        }
    }
    return 1;
}
int main() {
    char input[100];
    int num;
    scanf("%s", input);
    if (!isNumeric(input)) {
        printf("Invalid input\n");
        return 0;
    }
    scanf("%d", &n);
    if (num < 0 || num > 1000) {
        printf("Invalid input\n");
        return 0;
    }
    num++;
    while (!isPalindrome(num)) {
        num++;
    }
    printf("%d\n", num);
    return 0;
}