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:
import sys

n = int(sys.stdin.readline().rstrip())
xy = list(zip(*[map(int, sys.stdin.read().split())] * 2))

mask = (1 << 31) - 1
def solve(x, y, mode):
    u = x + y
    v = x - y
    if mode == 0:
        u -= 1
        v -= 1

    s = (u + mask) >> 1
    t = (v + mask) >> 1

    l = (~(s | t)) & mask
    r = s & t & mask
    d = (~s) & t & mask
    u = s & (~t) & mask

    res = ''
    for i in range(31):
        if l >> i & 1:
            res += 'L'
        elif r >> i & 1:
            res += 'R'
        elif d >> i & 1:
            res += 'D'
        elif u >> i & 1:
            res += 'U'
    if mode == 0:
        res += 'R'
    
    return [res]

def main():
    oe = (xy[0][0] + xy[0][1]) % 2
    for x, y in xy:
        if (x + y) % 2 != oe:
            print(-1)
            sys.exit()

    m = 31
    d = [2 ** i for i in range(31)]
    if oe == 0:
        d += [1]
        m += 1
    yield [m]
    yield d

    for x, y in xy:
        yield solve(x, y, oe)

if __name__ == '__main__':
    ans = main()
    for i in ans:
        print(*i, sep=' ')