function buildTable() {
  keyboard = [
    'QWERTYUIOPqwertyuiop',
    'ASDFGHJKLasdfghjkl',
    'ZXCVBNMzxcvbnm',
  ]
  var table = {}
  for (var row = 0; row < keyboard.length; row++) {
    for (var col = 0; col < keyboard[row].length; col++) {
      table[keyboard[row][col]] = row
    }
  }
  return table
}

function check(table, str) {
  freq = [0, 0, 0]
  for (var i = 0; i < str.length; i++) {
    freq[table[str[i]]]++
  }
  var num_zeroes = 0
  for (var i = 0; i < freq.length; i++) {
    if (freq[i] == 0) num_zeroes++
  }
  return num_zeroes == 2
}

var table = buildTable()
inputs = ['Alaska', 'dad', 'hello',]
for (var i = 0; i < inputs.length; i++) {
  if (check(table, inputs[i])) console.log(inputs[i])
}