题解 | 牛牛的金币

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')