Codeforces Round 300 |
---|

Finished |

Virtual contest is a way to take part in past contest, as close as possible to participation on time. It is supported only ICPC mode for virtual contests.
If you've seen these problems, a virtual contest is not for you - solve these problems in the archive.
If you just want to solve some problem from a contest, a virtual contest is not for you - solve this problem in the archive.
Never use someone else's code, read the tutorials or communicate with other person during a virtual contest.

constructive algorithms

math

sortings

*3100

No tag edit access

The problem statement has recently been changed. View the changes.

×
G. Berserk Robot

time limit per test

2 secondsmemory limit per test

256 megabytesinput

standard inputoutput

standard outputHelp! A robot escaped our lab and we need help finding it.

The lab is at the point (0, 0) of the coordinate plane, at time 0 the robot was there. The robot's movements are defined by a program — a string of length *l*, consisting of characters U, L, D, R. Each second the robot executes the next command in his program: if the current coordinates of the robot are (*x*, *y*), then commands U, L, D, R move it to cells (*x*, *y* + 1), (*x* - 1, *y*), (*x*, *y* - 1), (*x* + 1, *y*) respectively. The execution of the program started at time 0. The program is looped, i.e. each *l* seconds of executing the program start again from the first character. Unfortunately, we don't know what program was loaded into the robot when he left the lab.

Our radars managed to find out the position of the robot at *n* moments of time: we know that at the moment of time *t*_{i} the robot is at the point (*x*_{i}, *y*_{i}). Given this data, either help to determine what program could be loaded into the robot, or determine that no possible program meets the data and the robot must have broken down.

Input

The first line of the input contains two space-separated integers *n* and *l* (1 ≤ *n* ≤ 2·10^{5}, 1 ≤ *l* ≤ 2·10^{6}).

Next *n* lines contain three space-separated integers — *t*_{i}, *x*_{i}, *y*_{i} (1 ≤ *t*_{i} ≤ 10^{18}, - 10^{18} ≤ *x*_{i}, *y*_{i} ≤ 10^{18}). The radar data is given chronologically, i.e. *t*_{i} < *t*_{i + 1} for all *i* from 1 to *n* - 1.

Output

Print any of the possible programs that meet the data. If no program meets the data, print a single word 'NO' (without the quotes).

Examples

Input

3 3

1 1 0

2 1 -1

3 0 -1

Output

RDL

Input

2 2

1 1 0

999 1 0

Output

RL

Input

2 5

10 10 0

20 0 0

Output

NO

Codeforces (c) Copyright 2010-2023 Mike Mirzayanov

The only programming contests Web 2.0 platform

Server time: Jun/10/2023 14:37:03 (l1).

Desktop version, switch to mobile version.

Supported by

User lists

Name |
---|