Coordinate Quadrants

Problem

Given coordinates of two points on a plane, determine if they lie in the same quadrant (all coordinates are non-zero).

Specification

Four numbers are entered: coordinates of the first point (x1, y1) and the second point (x2, y2).

Output "YES" if the points are in the same quadrant, otherwise output "NO".

Sample Tests

Input #1

Output #1

YES

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