def cavityMap(grid):
    # Write your code here
    
    cavity = grid.copy() # overwriting original grid would cause error
    
    for i in range(1, len(grid)-1): # iterate thru each row ignore first and last
        
        cur = grid[i]
        pre = grid[i-1]
        nex = grid[i+1]
        
        for j in range(1, len(cur)-1): # identify cell and its adjacencies
            
            cell = cur[j]
            left = cur[j-1]
            rght = cur[j+1]
            topp = pre[j]
            botm = nex[j]
            
            if cell > left and cell > rght and cell > topp and cell > botm:
                cavity[i] = cavity[i][:j] + 'X' + cavity[i][j+1:]
                
    return cavity