# This example shows exceptions

import sys
import string
import exceptions

# Create a new exception
class LowerCaseException(exceptions.Exception):
   def __init__(self, args=None):
      self.args = args

# Input a character and perhaps raise an exception
def doInput():
        c = sys.stdin.read(1)

        if c == "":
            raise EOFError, 'End of file occurred'

        if c in string.lowercase:
           raise LowerCaseException, c

        return c


# Execution begins here
print "Enter some characters: "
while 1:
        try:
             char = doInput()

        except LowerCaseException, e:
             char = e[0]
             char = string.upper(char)                  

        except EOFError, e:                  
           print e
           sys.exit('Bye')

        except Exception, e:                  # Exception catches anything
           print e
           sys.exit('Something happened')


        if char == 'q': 
            break

        print char,

print "You entered quit"