/**
 * @param {number[]} fronts
 * @param {number[]} backs
 * @return {number}
 */
var flipgame = function (fronts, backs) {
  const res = []
  const some = []

  for (let i = 0; i < fronts.length; i++) {
    if (fronts[i] === backs[i]) some.push(fronts[i])
  }

  for (let i = 0; i < fronts.length; i++) {
    if (!some.includes(fronts[i])) res.push(fronts[i])
  }

  for (let i = 0; i < backs.length; i++) {
    if (!some.includes(backs[i])) res.push(backs[i])
  }

  return res.length > 0 ? Math.min(...res) : 0
};