#include #include

using namespace std;

int main() {

string initialString = "ABCDEFGHIJKLMNOPQR";
cout<<initialString<<endl;
for(int i = 0; i < 9; i++) {
	initialString = string(1, 'B' + i) + initialString.substr(0, initialString.length() - 1);
	cout<<initialString<<endl;
}
return 0;

}