Package for this problem was not updated by the problem writer or Codeforces administration after we’ve upgraded the judging servers. To adjust the time limit constraint, solution execution time will be multiplied by 2. For example, if your solution works for 400 ms on judging servers, then value 800 ms will be displayed and used to determine the verdict.

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

В условии задачи недавно были сделаны правки. Просмотреть изменения.

×
B. Hydra

time limit per test

2 secondsmemory limit per test

256 megabytesinput

standard inputoutput

standard outputOne day Petya got a birthday present from his mom: a book called "The Legends and Myths of Graph Theory". From this book Petya learned about a hydra graph.

A non-oriented graph is a hydra, if it has a structure, shown on the figure below. Namely, there are two nodes *u* and *v* connected by an edge, they are the hydra's chest and stomach, correspondingly. The chest is connected with *h* nodes, which are the hydra's heads. The stomach is connected with *t* nodes, which are the hydra's tails. Note that the hydra is a tree, consisting of *h* + *t* + 2 nodes.

Also, Petya's got a non-directed graph *G*, consisting of *n* nodes and *m* edges. Petya got this graph as a last year birthday present from his mom. Graph *G* contains no self-loops or multiple edges.

Now Petya wants to find a hydra in graph *G*. Or else, to make sure that the graph doesn't have a hydra.

Input

The first line contains four integers *n*, *m*, *h*, *t* (1 ≤ *n*, *m* ≤ 10^{5}, 1 ≤ *h*, *t* ≤ 100) — the number of nodes and edges in graph *G*, and the number of a hydra's heads and tails.

Next *m* lines contain the description of the edges of graph *G*. The *i*-th of these lines contains two integers *a*_{i} and *b*_{i} (1 ≤ *a*_{i}, *b*_{i} ≤ *n*, *a* ≠ *b*) — the numbers of the nodes, connected by the *i*-th edge.

It is guaranteed that graph *G* contains no self-loops and multiple edges. Consider the nodes of graph *G* numbered with integers from 1 to *n*.

Output

If graph *G* has no hydra, print "NO" (without the quotes).

Otherwise, in the first line print "YES" (without the quotes). In the second line print two integers — the numbers of nodes *u* and *v*. In the third line print *h* numbers — the numbers of the nodes that are the heads. In the fourth line print *t* numbers — the numbers of the nodes that are the tails. All printed numbers should be distinct.

If there are multiple possible answers, you are allowed to print any of them.

Examples

Input

9 12 2 3

1 2

2 3

1 3

1 4

2 5

4 5

4 6

6 5

6 7

7 5

8 7

9 1

Output

YES

4 1

5 6

9 3 2

Input

7 10 3 3

1 2

2 3

1 3

1 4

2 5

4 5

4 6

6 5

6 7

7 5

Output

NO

Note

The first sample is depicted on the picture below:

Codeforces (c) Copyright 2010-2020 Mike Mirzayanov

The only programming contests Web 2.0 platform

Server time: Sep/26/2020 16:25:22 (f2).

Desktop version, switch to mobile version.

Supported by

User lists

Name |
---|