Problem:
Score : 600 points

Problem Statement

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

Partial Score

In the test cases worth 300 points, -10 \leq X_i \leq 10 and -10 \leq Y_i \leq 10 hold.

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.

Sample Input 1

3
-1 0
0 3
2 -1

Sample Output 1

2
1 2
RL
UU
DR

In the given way to bring Joint m of the robot arm to each (X_j, Y_j), the positions of the joints will be as follows:

To (X_1, Y_1) = (-1, 0): First, the position of Joint 0 is (x_0, y_0) = (0, 0). As the mode of Section 1 is R, the position of Joint 1 is (x_1, y_1) = (1, 0). Then, as the mode of Section 2 is L, the position of Joint 2 is (x_2, y_2) = (-1, 0).

To (X_2, Y_2) = (0, 3): (x_0, y_0) = (0, 0), (x_1, y_1) = (0, 1), (x_2, y_2) = (0, 3).

To (X_3, Y_3) = (2, -1): (x_0, y_0) = (0, 0), (x_1, y_1) = (0, -1), (x_2, y_2) = (2, -1).

Sample Input 2

5
0 0
1 0
2 0
3 0
4 0

Sample Output 2

-1

Sample Input 3

2
1 1
1 1

Sample Output 3

2
1 1
RU
UR

There may be duplicated points among (X_j, Y_j).

Sample Input 4

3
-7 -3
7 3
-3 -7

Sample Output 4

5
3 1 4 1 5
LRDUL
RDULR
DULRD

Solution in C# (Mono 4.6.2.0) (judge verdict: Wrong Answer)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Diagnostics;

namespace AtCoder
{
    class Program
    {
        private static string Read() { return Console.ReadLine(); }
        private static int ReadInt() { return int.Parse(Read()); }
        private static long ReadLong() { return long.Parse(Read()); }
        private static double ReadDouble() { return double.Parse(Read()); }
        private static int[] ReadInts() { return Array.ConvertAll(Read().Split(), int.Parse); }
        private static long[] ReadLongs() { return Array.ConvertAll(Read().Split(), long.Parse); }
        private static double[] ReadDoubles() { return Array.ConvertAll(Read().Split(), double.Parse); }

        static Tuple<long[], string[]> Solve(int[][] P)
        {
            var C = new int[2];
            foreach (int[] p in P) { ++C[(p[0] + p[1]) & 1]; }
            if (C[0] != 0 && C[1] != 0) { return null; }
            int N = (C[0] == 0) ? 39 : 40;
            var S = new string[P.Length];
            for (int i = 0; i < S.Length; ++i)
            {
                var s = new char[N];
                long x = (N == 40) ? P[i][0] - 1 : P[i][0];
                long y = P[i][1];
                if (N == 40) { s[0] = 'L'; }
                for (int j = 38; j >= 0; --j)
                {
                    int k = j + N - 39;
                    if (Math.Abs(x) > Math.Abs(y))
                    {
                        if (x > 0)
                        {
                            s[k] = 'L';
                            x -= 1L << j;
                        }
                        else
                        {
                            s[k] = 'R';
                            x += 1L << j;
                        }
                    }
                    else
                    {
                        if (y > 0)
                        {
                            s[k] = 'D';
                            y -= 1L << j;
                        }
                        else
                        {
                            s[k] = 'U';
                            y += 1L << j;
                        }
                    }
                }
                Debug.Assert(x == 0 && y == 0);
                S[i] = new string(s);
            }
            var D = new List<long>();
            if (N == 40) { D.Add(1); }
            for (int i = 0; i < 39; ++i) { D.Add(1L << i); }
            return new Tuple<long[], string[]>(D.ToArray(), S);
        }
        static void Main(string[] args)
        {
            int N = ReadInt();
            var P = new int[N][];
            for (int i = 0; i < N; ++i) { P[i] = ReadInts(); }
            var ans = Solve(P);
            if (ans == null) { Console.WriteLine(-1); }
            else
            {
                Console.WriteLine(ans.Item1.Length);
                Console.WriteLine(string.Join(" ", ans.Item1));
                foreach (var s in ans.Item2) { Console.WriteLine(s); }
            }
        }
    }
}