s = "abc"
A = [list(s[c] if set([ord(s[c])]) <= set(xrange(ord('a'), ord('z')+1)) | set(xrange(ord('A'), ord('Z')+1)) else None for c in xrange(0 if l== 0 else len(s), len(s) if l== 0 else 0)]) for l in range(0,2)]
print A