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