'x' marks the spot.

Description:

Task:

Given a two dimensional array, return the co-ordinates of x.

If x is not inside the array, or if x appears multiple times, return [].

The co-ordinates should be zero indexed in row-major order.
You should assume you will always get an array as input. The array will only contain 'x's and 'o's.

Examples

Input: []

Return an empty array if input is an empty array => []

Input: [
  ['o', 'o'],
  ['o', 'o']
]

Return an empty array if no x found => []

Input: [
  ['x', 'o'],
  ['o', 'x']
]

Return an empty array if more than one x found => []

Input: [
  ['x', 'o'],
  ['o', 'o']
]
Return [0,0] when x at top left => [0, 0]

Input: [
  ['o', 'o', 'o', 'o', 'o', 'o', 'o', 'o'],
  ['o', 'o', 'o', 'o', 'o', 'o', 'o', 'o'],
  ['o', 'o', 'o', 'o', 'o', 'o', 'o', 'o'],
  ['o', 'o', 'o', 'o', 'o', 'o', 'o', 'o'],
  ['o', 'o', 'o', 'o', 'o', 'o', 'x', 'o'],
  ['o', 'o', 'o', 'o', 'o', 'o', 'o', 'o']
]
Return [4,6] for the example above => [4, 6]

Fundamentals

Arrays

Matrix

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