def cavityMap(n,grid):
    ans=[[0 for _ in range(n)] for _ in range(n)]
    for i in range(1,n-1):
        for j in range(1,n-1):
            mat=[int(grid[i][j+1]),int(grid[i-1][j]),int(grid[i+1][j]),int(grid[i][j-1])]
            if int(grid[i][j])>max(mat):
                ans[i][j]='X'
    for k in range(n):
        for l in range(n):
            if ans[k][l]=='X':
                pass
            else:
                ans[k][l]=grid[k][l]
    res=[]
    for row in ans:
        res.append(''.join(map(str,row)))
    return res