def gridChallenge(grid):
    rows = len(grid)
    long = len(grid[0])
    mx = [list(row) for row in grid]
    
    # rearrange elements for rows
    for idx, row in enumerate(mx):
        mx[idx] = sorted(row)
        
    # check for columns order
    for i in range(long):
        checking = []
        for row in mx:
            checking.append(row[i])
        print(i,checking,sep=":")
        for j in range(rows-1):
            if checking[j] > checking[j+1]:
                return 'NO'
    return 'YES'