#!/usr/bin/env python
# coding: iso-8859-1

h = {"als" : 5,
     "wie" : 3,
     "Von" : 3,
     "zu"  : 5,
     "von" : 10}

h2 = {}
for i in h.keys():
    if not h2.has_key(h[i]):
        h2[h[i]] = []
    h2[h[i]].append(i)

print h2