import java.util.*;

public class sookshmas
{
    public static void main(String[] args) {
        ArrayListInteger list = new ArrayListInteger(100);
        int count=2;
        for(int a=0;a10;a++){
            for(int b=0;b10;b++){
                int x=(a+b)%10;
                int y=(b+x)%10;
         System .out .print("Numbers :"+a+" "+b+"\n"+a+" "+b+" "+x+" "+y+" ");
           while(true){
           if((x==a)&&(y==b)){
           System .out .println ("\nLength :"+count);
           list.add(count);
           count =2;
        break ;
           }
           else{
        x=(x+y)%10;
               y=(y+x)%10;
               System .out .print(x+" "+y+" ");
               count+=2;
        }
       }
        System .out .println ("\n\n");
            }
        }
        Integer var = list .stream().max(Integer::compare).get(); 
  
        System.out.print("Max length is "+var);
        
    }
   
}