# -*- coding: utf-8 -*-
path = raw_input("Введіть шлях!")

x = 0
y = 0

pt = []
count = 0

class Position:

    def __init__(self, x, y):
        self.x = x
        self.y = y

for p in path:
	c = str(p)
	if c == 'r':
		x = x + 1
		count = count + 1
	elif c == 'l':
	    x = x - 1
	    count = count + 1
	elif c == 'u':
	    y = y + 1
	    count = count + 1
	elif c == 'd':
	    y = y - 1
	    count = count + 1
	t = str(count)
	t = Position(x, y)
	print 'x', t.x
	print 'y', t.y
	for i in int(count):
		n = str(i)
		if n.x == t.x and n.y == t.y:
			break


print count


#if c in count[]:
#print 'Fail'