import sys, ast

output = []

def flatten(input):
   for a in input:
     if isinstance(a, list):
       flatten(a)
     else:
       output.append(a)

if __name__ == '__main__':
  if len(sys.argv)<=1:
    print "Wrong number of arguments"
  flatten(ast.literal_eval(sys.argv[1]))
  print output