where does the default group roew in a router is stored what is the default size of memory in router

I have a file with data comming as 1,x1,x2,x3 2,a1,a2 3,b1,b2,b3,b4 1,y1,y2,y3 2,c1,c2,c3 3,d1,d2 my out put should be as follows x1,x2,x3,a1,a2,,b1,b2,b3,b4 y1,y2,y3,c1,c2,c3,d1,d2, Please let me know how can we acheive this in informatica Thanks in advance