class Solution:
  def judgeCircle(self, moves: str) -> bool: 
    counter = {"R":0,"L":0,"U":0,"D":0}
    pairs = {"R":"L","L":"R","U":"D","D":"U"}
    for m in moves:
      if counter[pairs[m]] > 0:
        counter[pairs[m]] -= 1
      else:
        counter[m] += 1
    for k,v in counter.items():
      if v != 0:
        return False
    return True