#include<stdio.h>
int main(){
    long n;
    scanf("%ld",&n);
    long c=1;
    while(c<=n){
            int i=0;
            long m=c;
                while(m!=0){
                    m/=10;
                    i++;
                }
            m=c;
            int arr[i];
            int brr[i];
            int j;
            int g=0;
                    for(j=0;j<i;j++){
                        arr[j]=m%10;
                        brr[i-j-1]=m%10;
                        m/=10;
                        if(arr[j]==brr[j]){
                            g++;
                        }
                        if(g==i){
                             printf("%ld\n",c);
                            break;
                        }
                    
                            }
                    c++;
    }
    return 0;
}