def solution(dirs):
# 4가지 명령어
udrl = {'U':(0, 1), 'D':(0, -1), 'R':(1, 0), 'L':(-1, 0)}
# 처음 걸어본 길
answer = set()
# 초기 위치
x, y = 0, 0
for d in dirs:
# 이동
(dx, dy) = udrl[d]
nx, ny = x+dx, y+dy
# 범위 내에 있는지 확인
if -5 <= nx <= 5 and -5 <= ny <= 5:
if d == 'U' or d == 'L':
answer.add("".join([str(i) for i in [x, y, nx, ny]]))
else:
answer.add("".join([str(i) for i in [nx, ny, x, y]]))
x, y = nx, ny
return len(answer)