def main():
    r = open(0).read()

    try:
        a, b = map(int, r.split())
        assert 0 <= a <= 12345 and 0 <= b <= 12345
        assert r == f'{a}\n{b}\n'
        print('OK')
    except:
        print('NG')


if __name__ == '__main__':
    main()