int main() {

//1

for (int i = 0; i < 10; ++i)
{
	//2
	for (int j = 0; j < 10; ++j)
	{
		//3
		for (int n = 0; n < 10;++n)
		{
			//4
			for (int m = 0; m < 10; ++m)
			{
				if ((i==j)&&(n==m)&&n!=i&&n!=j) {
				
					int result = i * 1000 + j * 100 + n * 10 + m;
					if (sqrt(result)==(int)sqrt(result)) {
					
						printf("%d",result);
					}

				}
			}
		}
	}

}

}