------
## 最终结论
```python
def minimum_Length(s):
    from collections import Counter
    char_count = Counter(s)
    min_freq = min(char_count.values())
    return len(s) - min_freq

# Test cases
assert minimum_Length("mnm") == 1
assert minimum_Length("abcda") == 3
assert minimum_Length("abcb") == 2
```