#include<stdio.h>
int isalpalindrome(int n){
    int original = n,reversed = 0,digit;
    while(n>0){
         digit = n % 10;
         reversed = reversed*10 + digit;
         n/=10;
    } 
    return original == reversed;
}
int mani (){
    int n;
    if(scanf("%d",&n) != 1){
        printf("Invalid input");
        return 0;
    }
    if (n<0 || n> 1000){
         printf("Invalid input");
         return 0;
    }
    int next = n + 1;
    while (!isalpalindrome(next))
    {
         next++;
    }
    printf("<1", next);
    return 0;
}