------
## 最终结论
```python
def tup_string(tup):
    return ''.join(tup)

# Test cases
assert tup_string(('e', 'x', 'e', 'r', 'c', 'i', 's', 'e', 's')) == "exercises"
assert tup_string(('p','y','t','h','o','n')) == "python"
assert tup_string(('p','r','o','g','r','a','m')) == "program"
```