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.

No tag edit access

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

×
E. Dasha and Puzzle

time limit per test

2 secondsmemory limit per test

256 megabytesinput

standard inputoutput

standard outputDasha decided to have a rest after solving the problem. She had been ready to start her favourite activity — origami, but remembered the puzzle that she could not solve.

The tree is a non-oriented connected graph without cycles. In particular, there always are *n* - 1 edges in a tree with *n* vertices.

The puzzle is to position the vertices at the points of the Cartesian plane with integral coordinates, so that the segments between the vertices connected by edges are parallel to the coordinate axes. Also, the intersection of segments is allowed only at their ends. Distinct vertices should be placed at different points.

Help Dasha to find any suitable way to position the tree vertices on the plane.

It is guaranteed that if it is possible to position the tree vertices on the plane without violating the condition which is given above, then you can do it by using points with integral coordinates which don't exceed 10^{18} in absolute value.

Input

The first line contains single integer *n* (1 ≤ *n* ≤ 30) — the number of vertices in the tree.

Each of next *n* - 1 lines contains two integers *u*_{i}, *v*_{i} (1 ≤ *u*_{i}, *v*_{i} ≤ *n*) that mean that the *i*-th edge of the tree connects vertices *u*_{i} and *v*_{i}.

It is guaranteed that the described graph is a tree.

Output

If the puzzle doesn't have a solution then in the only line print "NO".

Otherwise, the first line should contain "YES". The next *n* lines should contain the pair of integers *x*_{i}, *y*_{i} (|*x*_{i}|, |*y*_{i}| ≤ 10^{18}) — the coordinates of the point which corresponds to the *i*-th vertex of the tree.

If there are several solutions, print any of them.

Examples

Input

7

1 2

1 3

2 4

2 5

3 6

3 7

Output

YES

0 0

1 0

0 1

2 0

1 -1

-1 1

0 2

Input

6

1 2

2 3

2 4

2 5

2 6

Output

NO

Input

4

1 2

2 3

3 4

Output

YES

3 3

4 3

5 3

6 3

Note

In the first sample one of the possible positions of tree is:

Codeforces (c) Copyright 2010-2022 Mike Mirzayanov

The only programming contests Web 2.0 platform

Server time: May/29/2022 12:26:10 (g1).

Desktop version, switch to mobile version.

Supported by

User lists

Name |
---|