#!/usr/bin/env python
import sys
 
entries = {}
for line in open(sys.argv[1]):
    [left, right] = line.split()    
    try:                                
        entries[right].append(left)        # or use has_key
    except KeyError:                       # or e[r] = e.get(r, []) + [l]
        entries[right] = [left]
 
for (right, lefts) in entries.items():
  print "%04d '%s'\titems => %s" % (len(lefts), right,lefts)