n = int(input())
print("ABC" if n == 1 else "chokudai")
9bab183528d54db2f2e919dc5da7f958ced271bf
<mask token>

<mask token>
print('ABC' if n == 1 else 'chokudai')

n = int(input())
print('ABC' if n == 1 else 'chokudai')

n = int(input())
print("ABC" if n == 1 else "chokudai")