a=input()[0]
if 'a'<=a<='z':
  print("lower")
elif 'A'<=a<='Z':
  print("upper")
elif ('0'<=a<='9'):
  print("digit")
else:
  pass


/**************************************************************
	Problem: 1970
	User: admin
	Language: Python
	Result: Accepted
	Time:188 ms
	Memory:34244 kb
****************************************************************/