function solution(dirs) {
  let answer = [];
  let gps = [0,0];
  dirs.split("").forEach((value) => {
    let ret = false;
    const pre_gps = gps.concat();
    if (value == "U" && gps[1] < 5)
    {
      gps[1] += 1;
      ret = true;
    }
    else if (value == "D" && gps[1] > -5)
    {
      gps[1] -= 1;
      ret = true;
    }
    else if (value == "R" && gps[0] < 5)
    {
      gps[0] += 1;
      ret = true;
    }
    else if (value == "L" && gps[0] > -5)
    {
      gps[0] -= 1;
      ret = true;
    }
    //길은 양뱡향이 아닌 단방향으로 취급("L,R" => ret : 1)
    const filter = answer.filter(item => {
      return item[0] == pre_gps[0] && item[1] == pre_gps[1] && item[2] == gps[0] && item[3] == gps[1] || item[0] == gps[0] && item[1] == gps[1] && item[2] == pre_gps[0] && item[3] == pre_gps[1]
    })
    if (ret && filter.length == 0)
      answer.push(pre_gps.concat(gps));
    });

  return answer.length;
}