#2022/5/18 16:15
x,y=map(int,input().split())
x1,y1=map(int,input().split())
if (abs(x1-x)+abs(y1-y))==1 and x1-x==1:
    print("r")
elif (abs(x1-x)+abs(y1-y))==1 and y1-y==1:
    print("u")
elif (abs(x1-x)+abs(y1-y))==1 and x1-x==-1:
    print("l")
elif (abs(x1-x)+abs(y1-y))==1 and y1-y==-1:
    print("d")