me too

(language : c++)
using my code, I can pass random test but can't pass my sample tests.
As I've read about removing last character '\n'. I've done that too but again it showed my test has been failed.
I have printed output on log using cout as following:
aabbccdd
aabbccdd
aabbccdd
eeffgghh
eeffgghh
eeffgghh
iijjkkll
iijjkkll
iijjkkll
mmnnoopp
mmnnoopp
mmnnoopp

but still can not pass sample tests.