#include<bits/stdc++.h>
using namespace std;
int main() {
    int g,s,b,q;
    for(int i=1000;i<=9999;i++){
        g=i%10;
        s=i/10%10;
        b=i/100%10;
        q=i/1000;
        if(g==s&&b==q&&sqrt(i)==int(sqrt(i))) cout<<i<<endl;   
    }
}
/**************************************************************
	Problem: 1092
	User: wangyiyang
	Language: C++
	Result: Accepted
	Time:4 ms
	Memory:2072 kb
****************************************************************/