include<bits/stdc++.h>

using namespace std; int main() {

int d, num;
for(int i = 1; i <= 9; ++i)
	for(int j = 0; j <= 9; ++j)
	{
		num = i*1000+i*100+j*10+j;
		d = sqrt(num);//sqrt()结果是浮点型，赋值给整型d后，向下取整
		if(num == d*d)
			cout << num << endl;
	}
return 0;	

}