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 CPP):

Solution:
#include <bits/stdc++.h>
using namespace std;
#define N 1010
int x[N],y[N],d[N],vis[2];
inline int read() {
    int x=0,f=1;
    char ch=getchar();
    while (!isdigit(ch)) {
        if (ch=='-') f=-1;
        ch=getchar();
    }
    while (isdigit(ch)) x=x*10+ch-'0',ch=getchar();
    return x*f;
}
int main() {
    int n=read(),m=0;
    for (int i=1;i<=n;i++) {
        x[i]=read(),y[i]=read();
        vis[(x[i]+y[i])&1]=true;
    }
	if (vis[0]&vis[1]) return puts("-1")&0;
	if (vis[0]) d[++m]=1;
	for (int i=30;i>=0;i--) d[++m]=1<<i;
	printf("%d\n",m);
	for (int i=1;i<=m;i++) printf("%d ",d[i]); putchar('\n');
	for (int i=1;i<=n;i++) {
		for (int j=1;j<=m;j++) {
			if (abs(x[i])>abs(y[i])) {
				if (x[i]>0) x[i]-=d[j],putchar('R');
				else x[i]+=d[j],putchar('L');
			} else {
				if (y[i]>0) y[i]-=d[j],putchar('U');
				else y[i]+=d[j],putchar('D');
			}
		}
        putchar('\n');
	}
	return 0;
}