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function isValidWalk(walk) {
  const score = walk.reduce((acc, step) => {
    if (step === 'n') acc.upDown += 1;
    if (step === 's') acc.upDown -= 1;
    if (step === 'e') acc.leftRight += 1;
    if (step === 'w') acc.leftRight -= 1;
    
    return acc
  }, { upDown: 0, leftRight: 0 })
  
  return score.upDown === 0 && score.leftRight === 0 && walk.length === 10
}