Function call expression by bk1e

def f(x,a=""):
 if""==x:return a,
 h=x[0]
 t=x[1:]
 if h=="f":
  return f(t,h)
 elif h=="(":
  b,u=f(t)
  return f(u,"("+a+" "+b+")")
 return a,t
while 1:
 print f(raw_input())[0]

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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return top