from taintmode import *

@untrusted
def from_outside():
    s = raw_input('Give me some input:')
    return s 

@ssink(OSI)
def shell_cmd(s): 
    # Here, we call some shell command using s
    return 

@cleaner(OSI)
def no_osi(s): 
    # Here, it sanatizes the data
    return ''


i = from_outside()

# shell_cmd(i) 

# clean_i = no_osi(i)
# shell_cmd(clean_i)