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