题解 | #牛牛的金币#

x,y=map(int,input().split())
x1,y1=map(int,input().split())
if x==x1 and y1-y==1:
    print("u")
elif x==x1 and y1-y==-1:
    print("d")
elif y==y1 and x1-x==1:
    print("r")
else:
    print("l")