A funny problem in my yahoo account

Hello,

With more than a year, I have not sing in to my yahoo mail ( and let's name it A ), now i go to my email (A) and sing in, it tell my to i must go to email B and copy a code and put it in a circle, now i go to email B ( and i have more than a year have not sing in to it ) and he tell me the same thing: go to email A and copy the code ...

What can i do now ??