Problem: Snuke is introducing a robot arm with the following properties to his factory:

* The robot arm consists of m sections and m+1 joints. The sections are numbered 1, 2, ..., m, and the joints are numbered 0, 1, ..., m. Section i connects Joint i-1 and Joint i. The length of Section i is d_i.
* For each section, its mode can be specified individually. There are four modes: `L`, `R`, `D` and `U`. The mode of a section decides the direction of that section. If we consider the factory as a coordinate plane, the position of Joint i will be determined as follows (we denote its coordinates as (x_i, y_i)):
* (x_0, y_0) = (0, 0).
* If the mode of Section i is `L`, (x_{i}, y_{i}) = (x_{i-1} - d_{i}, y_{i-1}).
* If the mode of Section i is `R`, (x_{i}, y_{i}) = (x_{i-1} + d_{i}, y_{i-1}).
* If the mode of Section i is `D`, (x_{i}, y_{i}) = (x_{i-1}, y_{i-1} - d_{i}).
* If the mode of Section i is `U`, (x_{i}, y_{i}) = (x_{i-1}, y_{i-1} + d_{i}).



Snuke would like to introduce a robot arm so that the position of Joint m can be matched with all of the N points (X_1, Y_1), (X_2, Y_2), ..., (X_N, Y_N) by properly specifying the modes of the sections. Is this possible? If so, find such a robot arm and how to bring Joint m to each point (X_j, Y_j).

Constraints

* All values in input are integers.
* 1 \leq N \leq 1000
* -10^9 \leq X_i \leq 10^9
* -10^9 \leq Y_i \leq 10^9

Input

Input is given from Standard Input in the following format:


N
X_1 Y_1
X_2 Y_2
:
X_N Y_N


Output

If the condition can be satisfied, follow the following format. If the condition cannot be satisfied, print `-1`.


m
d_1 d_2 ... d_m
w_1
w_2
:
w_N


m and d_i are the configurations of the robot arm. Refer to the problem statement for what each of them means. Here, 1 \leq m \leq 40 and 1 \leq d_i \leq 10^{12} must hold. Also, m and d_i must all be integers.

w_j is a string of length m that represents the way to bring Joint m of the robot arm to point (X_j, Y_j). The i-th character of w_j should be one of the letters `L`, `R`, `D` and `U`, representing the mode of Section i.

Examples

Input

3
-1 0
0 3
2 -1


Output

2
1 2
RL
UU
DR


Input

5
0 0
1 0
2 0
3 0
4 0


Output

-1


Input

2
1 1
1 1


Output

2
1 1
RU
UR


Input

3
-7 -3
7 3
-3 -7


Output

5
3 1 4 1 5
LRDUL
RDULR
DULRD

Solution (in PYTHON3):

Solution:
def d_robot_arms(N, Pos):
    # 参考: http://drken1215.hatenablog.com/entry/2018/09/30/002900
    ans = []

    pos = []
    # すべての座標でパリティが一定でなければ、条件を満たす腕を作りようがない
    parity = (abs(Pos[0][0]) + abs(Pos[0][1])) % 2
    for x, y in Pos:
        parity_current = (abs(x) + abs(y)) % 2
        if parity != parity_current:
            return -1
        pos.append([x - y, x + y])
        # u=x-y, v=x+y とすると、 点(u, v)は
        # 原点周りに45度回転させる座標変換によって点(x, y)から移される点

    d = []
    # log2(10**9)=29.90 なので、2**30以下の2の冪乗の足し引きで10**9までの奇数を生成できる
    for i in range(30, -1, -1):
        d.append(1 << i)
    if parity % 2 == 0:
        d.append(1)
    ans.append(str(len(d)))
    ans.append(' '.join(list(map(str, d))))

    for i in range(N):
        # u, v座標はそれぞれ独立に見て構わない
        udir, vdir = 0, 0
        usum, vsum = 0, 0
        tmp = []
        for j in range(len(d)):
            if usum <= pos[i][0]:
                udir = 1
                usum += d[j]
            else:
                udir = -1
                usum -= d[j]

            if vsum <= pos[i][1]:
                vdir = 1
                vsum += d[j]
            else:
                vdir = -1
                vsum -= d[j]

            # uv平面で軸と平行に(正の向き:1, 負の向き:-1)移動することと
            # xy平面での移動モード(UDLR)との対応
            if udir == 1 and vdir == 1:
                tmp.append('R')
            elif udir == 1 and vdir == -1:
                tmp.append('D')
            elif udir == -1 and vdir == -1:
                tmp.append('L')
            else:
                tmp.append('U')
        ans.append(''.join(tmp))
    ans = '\n'.join(ans)
    return ans

N = int(input())
Pos = [[int(i) for i in input().split()] for j in range(N)]
print(d_robot_arms(N, Pos))