I crafted this compact solution to Dijkstra’s OddWordProblem:

from sys import stdin, stdout
def even(char) : stdout.write(char); return select(even, 0, "");
def odd(char)  : q = select(odd, 0, ""); stdout.write(char); return q
def select(fn, skipspace, prefix) :
  char = stdin.read(1)
  if char.isspace() and skipspace : return select(fn, 1, prefix)
  elif char.isspace()             : return 0
  elif char.isalpha()             : stdout.write(prefix); return fn(char)
  elif char == "."                : return 1
  else                            : raise "Invalid input"

if not select(even, 1, "") :
while not select(odd, 1, " ") and not select(even, 1, " ") : pass
stdout.write(".")