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Task/Odd-word-problem/Python/odd-word-problem-3.py

@@ -0,0 +1,28 @@
+from sys import stdin, stdout
+
+def char_in(): return stdin.read(1)
+def char_out(c): stdout.write(c)
+
+def odd():
+	a = char_in()
+	if a.isalpha():
+		r = odd()
+		char_out(a)
+		return r
+
+	# delay printing terminator until later, in the shape of a closure
+	def clos():
+		char_out(a)
+		return a != '.'
+
+	return clos
+
+def even():
+	while True:
+		c = char_in()
+		char_out(c)
+		if not c.isalpha(): return c != '.'
+
+e = False
+while odd()() if e else even():
+	e = not e