#include <iostream>
#include <iomanip>
#include <cmath>
using namespace std;
int main(){
	
	cout << "ABCDEFGHIJKLMNOPQR" << endl;
	cout << "BABCDEFGHIJKLMNOPQ" << endl;
	cout << "CBABCDEFGHIJKLMNOP" << endl;
	cout << "DCBABCDEFGHIJKLMNO" << endl;
	cout << "EDCBABCDEFGHIJKLMN" << endl;
	cout << "FEDCBABCDEFGHIJKLM" << endl;
	cout << "GFEDCBABCDEFGHIJKL" << endl;
	cout << "HGFEDCBABCDEFGHIJK" << endl;
	cout << "IHGFEDCBABCDEFGHIJ" << endl;
	cout << "JIHGFEDCBABCDEFGHI" << endl;
	return 0;
}