<b_jonas> learn ayacc is ais523\'s yacc parser generator implementation, get it from http://nethack4.org/pastebin/ayacc-2020-04.tar.gz or from darcs clone http://nethack4.org/projects/ayacc

#!/usr/bin/env python
import sys
sys.stdout.write ((lambda s: "".join([(s[i].upper() if i%2==0 else s[i].lower()) for i in range(len(s)) ]))(open("/dev/stdin").read()))