------
## 最终结论
```python
def minDeletionSize(A):
    if not A: return 0
    rows, cols = len(A), len(A[0])
    
    # Initialize a dp array to keep track of the longest increasing subsequence
    dp = [1] * cols
    
    # Iterate through each column starting from the second column
    for j in range(1, cols):
        for i in range(j):
            # Check if the current column maintains the increasing order with respect to the previous column
            if all(A[k][i] <= A[k][j] for k in range(rows)):
                dp[j] = max(dp[j], dp[i] + 1)
    
    return cols - max(dp)

# Test cases
print(minDeletionSize(["babca","bbazb"]))  # Output: 3
print(minDeletionSize(["edcba"]))          # Output: 4
print(minDeletionSize(["ghi","def","abc"]))# Output: 0
```