#!/usr/bin/env python

import sys

delimiter=" "
if "-d" in sys.argv:
    idx=sys.argv.index("-d");
    delimiter=sys.argv[idx+1];
    sys.argv.pop(idx);
    sys.argv.pop(idx);

oldprefix=""
juststarted=True
for l in sys.stdin:
    l=l[:-1]
    tok=l.split(delimiter)
    prefix=tok[0]
    l=l[(len(prefix)+1):]


    if oldprefix != prefix:
        if not juststarted:
            print 
        juststarted=False
        oldprefix=prefix
        print prefix,
    print l,