------
## 最终结论
```python
import re

def match(s):
    if re.search(r'[A-Z][a-z]+', s):
        return 'Yes'
    else:
        return 'No'

# Test cases
assert match("Geeks") == 'Yes'
assert match("geeksforGeeks") == 'Yes'
assert match("geeks") == 'No'
```