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  1.  
  2. def longcomstr(l):
  3. 	c=l[0]
  4. 	s=''
  5. 	n=len(c)
  6. 	for i in range(1,len(l)):
  7. 		for j in range(0,len(l) and n):
  8. 			if c[j]!=l[i][j]:
  9. 				break
  10. 			s=s+c[j]
  11. 	print(s)
  12. def main():
  13. 	try:
  14. 		strarr=input()
  15. 		l=strarr.split()
  16. 		longcomstr(l)
  17. 	except:
  18. 		print('invalid')
  19.  
  20. main()
Success #stdin #stdout 0.01s 118784KB
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invalid
https://ideone.com/DITbXk
language:
Python (PyPy 2.7.13)
created:
5 years ago
visibility:
public

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