------
## 最终结论
```python
def Find_Min_Length(lst):
    lengths = [len(sublist) for sublist in lst]
    return min(lengths)

# Test cases
assert Find_Min_Length([[1],[1,2]]) == 1
assert Find_Min_Length([[1,2],[1,2,3],[1,2,3,4]]) == 2
assert Find_Min_Length([[3,3,3],[4,4,4,4]]) == 3
```