#include <iostream>
#include <string>

using namespace std;

int main() {
	string s = "ABCDEFGHIJK";

	for(size_t i = 0; i + 3 < s.length(); i += 3)
	{
		s[i] ^= s[i + 2];
		s[i + 2] ^= s[i];
		s[i] ^= s[i + 2];
	}
	
	cout << s << endl;
}