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>
#define LL long long
using namespace std;
const int maxn = 1010;
int n,sz;
LL x[maxn],y[maxn],bs[35],ans[35];
inline int ABS(int x) {if(x<0) x=-x;    return x;}
void work(){
    cin >> n;
    for (int i = 0; i < n; i++) cin >> x[i] >> y[i];
    int sum = (x[0] ^ y[0]) & 1;
    for (int i = 0; i < n; i++) if ( ((x[i] ^ y[i]) & 1 ) ^ sum) {cout<<"-1"<<endl;return;}

    sz = 0;
    for (int i=30;i>-1;i--) ans[sz++] = bs[i];
    if (sum == 0) ans[sz++] = 1;

    cout<<sz<<endl;
    for (int i=0;i<sz;i++) cout<<ans[i]<<" ";cout<<endl;

    for (int i = 0; i < n; i++) {
        int u = x[i], v = y[i];
        for (int j = 0 ; j < sz ; j++) {
            if (ABS(u) > ABS(v)){
                if (u < 0) cout<<"L", u += ans[j];
                else cout<<"R", u -= ans[j];
            }else{
                if (v < 0) cout<<"D", v += ans[j];
                else cout<<"U", v -= ans[j];
            }
        }
        cout<<endl;
    }
}
int main(){
    bs[0] = 1;
    for (int i=1;i<32;i++) bs[i] = bs[i-1] << 1;
    work();
    return 0;
}