Robot Return to Origin

A robot starts at the origin (0, 0) on a 2D plane. It is given a sequence of moves represented by the characters N (north), S (south), E (east), and W (west). The robot's final position \((x, y)\) is computed by:

\(x = \text{\#E} - \text{\#W}, \quad y = \text{\#N} - \text{\#S}\)

The robot returns to its starting position if and only if \(x = 0\) and \(y = 0\). Your task is to determine whether the robot returns to the origin after executing all the given instructions.

inputFormat

The input consists of a single line containing a non-empty string of movement instructions. Each character in the string is one of N, S, E, or W.

Example: ENWS

outputFormat

Output a single line: YES if the robot returns to the origin, or NO otherwise.

ENWS

YES