import java.util.*;enum M{M;System z;int i;String t,a[];{for(Scanner s=new Scanner(z.in);z==z;z.out.println(t))for(a=s.nextLine().split(" ");!(t=a[i/9%3]+a[i/3%3]+a[i++%3]).matches(".(.)\\1(.)\\2."););}}
Note that non-ascii characters in the above source code will be escaped (such as \x9f).