def gridChallenge(grid: Array[String]): String = {
    // Write your code here
    val sortedGrid = grid.map(row => row.sorted)
    val n = sortedGrid.length
    val m = sortedGrid(0).length
    for (col <- 0 until m) {
    for (row <- 0 until n - 1) {
      if (sortedGrid(row)(col) > sortedGrid(row + 1)(col)) {
        return "NO"
      }
    }
  }

  "YES"


    }