#include <iostream>
using namespace std;
int main() {
	int n,i,a,b,c,d;
	cin>>n;
	if(n>10000){
		n=9999;
	}
	for(i=1000;i<=n;i++){
		a=i/1000;
		b=i/100%10;
		c=i/10%10;
		d=i%10;
		if(c*1000+d*100+a*10+b==i&&i%2==0){
			cout<<i<<endl;
		}
	}
}
/**************************************************************
	Problem: 1737
	User: panyuchen
	Language: C++
	Result: Wrong Answer
****************************************************************/