AC

#include<bits/stdc++.h>
using namespace std;
bool func(int x){
string s = to_string(x);
string rev_s = s;
reverse(s.begin(),s.end());
return rev_s == s;
}
int main(){
int n;
cin >> n;
for(int i = 1;i <= n;i++){
if(func(i))cout << i << endl;
}
return 0;
}