#include<bits/stdc++.h>
int main(){
		int k,tmp;
	for(int i=1000;i<=9999;i++){\
		k=0;tmp=i;
		int q=i*9;
		while(tmp>0){
			k*=10;
			k+=(tmp%10);
			tmp/=10;
		}
		if(q==k) printf("%d\n",i);
	}

}