Virtual contest is a way to take part in past contest, as close as possible to participation on time. It is supported only ACM-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

E. Vanya and Field

time limit per test

2 secondsmemory limit per test

256 megabytesinput

standard inputoutput

standard outputVanya decided to walk in the field of size *n* × *n* cells. The field contains *m* apple trees, the *i*-th apple tree is at the cell with coordinates (*x*_{i}, *y*_{i}). Vanya moves towards vector (*dx*, *dy*). That means that if Vanya is now at the cell (*x*, *y*), then in a second he will be at cell . The following condition is satisfied for the vector: , where is the largest integer that divides both *a* and *b*. Vanya ends his path when he reaches the square he has already visited.

Vanya wonders, from what square of the field he should start his path to see as many apple trees as possible.

Input

The first line contains integers *n*, *m*, *dx*, *dy*(1 ≤ *n* ≤ 10^{6}, 1 ≤ *m* ≤ 10^{5}, 1 ≤ *dx*, *dy* ≤ *n*) — the size of the field, the number of apple trees and the vector of Vanya's movement. Next *m* lines contain integers *x*_{i}, *y*_{i} (0 ≤ *x*_{i}, *y*_{i} ≤ *n* - 1) — the coordinates of apples. One cell may contain multiple apple trees.

Output

Print two space-separated numbers — the coordinates of the cell from which you should start your path. If there are several answers you are allowed to print any of them.

Examples

Input

5 5 2 3

0 0

1 2

1 3

2 4

3 1

Output

1 3

Input

2 3 1 1

0 0

0 1

1 1

Output

0 0

Note

In the first sample Vanya's path will look like: (1, 3) - (3, 1) - (0, 4) - (2, 2) - (4, 0) - (1, 3)

In the second sample: (0, 0) - (1, 1) - (0, 0)

Codeforces (c) Copyright 2010-2017 Mike Mirzayanov

The only programming contests Web 2.0 platform

Server time: May/23/2017 15:49:01 (c4).

Desktop version, switch to mobile version.
User lists

Name |
---|