#include<bits/stdc++.h>
using namespace std;
int main(){
	int i,n,a;
	for(i=1000;i<=9999;i++){
		n=i/100;
		a=i%100;
		if((a+n)*(a+n)==i){
		cout<<i<<endl;
	} 

}
}
/**************************************************************
	Problem: 1085
	User: wengsihan
	Language: C++
	Result: Accepted
	Time:5 ms
	Memory:2072 kb
****************************************************************/