#include <bits/stdc++.h> using namespace std; int main() { for(int i = 1000;i <= 9999;i++) { int g = i % 10; int s = i / 10 % 10; int b = i / 100 % 10; int q = i / 1000; int m = (q*10+b*1+s*10+g*1)*(q*10+b*1+s*10+g*1); if(m == i) { cout<<i<<endl; } } return 0; }