#include <bits/stdc++.h>
using namespace std;
int main(){
	int a,x,y;
	for(a=1000;a<=9999;a++){
	x=a/100;	
	y=a-x*100;
	if((x+y)*(x+y)==a)	
	cout<<a;	
	
	}
	
	return 0;
	}
/**************************************************************
	Problem: 1085
	User: fzy001
	Language: C++
	Result: Wrong Answer
****************************************************************/