Problem with PythonPrintHexStr task

When I try to run this code by hitting the Python 3 button it works and also in my local Python3.4 env. I get the right answer too but when I try to submit I get this error:

**For 'A0!' we got 'Error: Unknown instruction import in the line 1! ...' which is incorrect :(

My code:

import sys
import string

input_line = input()
hex_list =list()

string_list = list (input_line)

for a in string_list :
    hex_list.append((hex(ord(a)))[2:])

for a in hex_list :
    a= str.upper(a)
    print(a,end='')

Any ideas why?

Never mind- I just re-read it :

*Your solution should be a valid source for Intel 4004 emulator!