#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,b,c,d,e,f,i,n,p;
	for(i=1000;i<=9999;i++){
		a=i%10;
		b=i/10%10;
		c=i/100%10;
		d=i/1000;
		e=a+b*10;
		f=c+d*10;
		p=(e+f)*(e+f);
		if(p==i){
			cout<<i<<endl;
		}
	} 
	return 0;
}

/**************************************************************
	Problem: 1085
	User: tangkaixuan
	Language: C++
	Result: Accepted
	Time:4 ms
	Memory:2072 kb
****************************************************************/