tickets="""Afghanistan 4/17-4/18
Albania 9/25-10/2
Algeria 11/23-11/25
Andorra 8/22-8/27
Angola 5/18-5/19
Anguilla 3/2-3/3
Antarctica 6/3-6/5
Argentina 2/2-2/7
Armenia 5/18-5/21
Aruba 1/1-1/8
Australia 3/25-3/31
Austria 2/7-2/8
Azerbaijan 4/11-4/13
Bahamas 8/20-8/24
Bahrain 7/26-7/31
Bangladesh 6/22-6/26
Barbados 9/5-9/7
Belarus 9/8-9/15
Belgium 6/8-6/10
Belize 7/6-7/10
Benin 8/6-8/10
Bermuda 9/3-9/6
Bhutan 9/14-9/19
Botswana 11/23-11/24
Brazil 7/10-7/13
Bulgaria 2/15-2/22
Burundi 3/6-3/8
Cambodia 3/16-3/22
Cameroon 12/3-12/9
Canada 9/26-9/27
Chad 12/1-12/3
Chile 5/7-5/13
China 1/14-1/18
Colombia 3/2-3/5
Comoros 8/26-8/28
Congo 4/2-4/9
Cuba 1/10-1/17
Cyprus 6/27-6/28
Denmark 2/22-2/24
Djibouti 5/19-5/24
Dominica 12/19-12/24
Ecuador 12/7-12/8
Egypt 12/5-12/6
Eritrea 10/15-10/17
Estonia 11/4-11/11
Ethiopia 8/1-8/6
Fiji 11/19-11/20
Finland 2/18-2/19
France 6/29-7/3
Gabon 3/27-4/3
Gambia 9/25-9/28
Georgia 2/29-3/2
Germany 3/17-3/21
Ghana 11/7-11/9
Gibraltar 7/10-7/15
Greece 11/27-11/28
Greenland 5/3-5/6
Grenada 10/11-10/18
Guadeloupe 12/20-12/24
Guam 4/11-4/16
Guatemala 3/6-3/9
Guernsey 9/13-9/16
Guinea 6/4-6/8
Guyana 10/26-10/30
Haiti 1/20-1/24
Hungary 1/20-1/24
Iceland 7/25-8/1
India 7/21-7/28
Indonesia 8/20-8/27
Iraq 9/12-9/18
Ireland 10/25-10/28
Israel 6/11-6/18
Italy 2/6-2/12
Jamaica 1/23-1/25
Jersey 1/31-2/6
Jordan 12/5-12/6
Kazakhstan 4/2-4/8
Kenya 7/29-8/4
Kiribati 1/3-1/5
Kuwait 7/14-7/18
Kyrgyzstan 6/13-6/14
Latvia 2/6-2/12
Lebanon 1/10-1/14
Lesotho 1/29-2/3
Liberia 7/14-7/18
Libya 4/19-4/21
Liechtenstein 3/30-4/2
Lithuania 5/2-5/8
Luxembourg 8/28-8/31
Macao 4/3-4/10
Madagascar 11/15-11/22
Malawi 9/20-9/21
Malaysia 11/10-11/16
Maldives 10/31-11/5
Mali 9/17-9/24
Malta 8/23-8/25
Martinique 7/28-7/29
Mauritania 10/13-10/20
Mauritius 12/21-12/28
Mayotte 10/24-10/29
Mexico 2/24-3/2
Monaco 12/4-12/7
Mongolia 5/6-5/8
Montenegro 8/9-8/11
Montserrat 12/12-12/16
Morocco 6/26-6/29
Mozambique 2/18-2/21
Myanmar 11/29-12/3
Namibia 10/10-10/12
Narnia 6/8-6/9
Nauru 12/15-12/19
Nepal 5/6-5/8
Netherlands 12/8-12/12
Nicaragua 9/29-10/2
Niger 4/28-5/5
Nigeria 7/23-7/25
Niue 5/14-5/21
Norway 5/8-5/9
Oman 2/13-2/16
Pakistan 6/11-6/16
Palau 6/11-6/14
Panama 7/18-7/20
Paraguay 11/9-11/15
Peru 12/5-12/7
Philippines 4/6-4/11
Pitcairn 6/24-6/29
Poland 8/27-8/28
Portugal 5/27-5/31
Qatar 1/16-1/23
Romania 7/5-7/7
Rwanda 6/6-6/7
Samoa 7/1-7/2
Senegal 11/19-11/20
Serbia 6/20-6/24
Seychelles 8/12-8/17
Singapore 7/23-7/25
Slovakia 6/16-6/17
Slovenia 9/17-9/19
Somalia 10/22-10/27
Spain 9/24-9/29
Sudan 1/8-1/10
Suriname 11/28-11/29
Swaziland 6/10-6/16
Sweden 8/23-8/24
Switzerland 8/31-9/4
Tajikistan 1/20-1/23
Thailand 6/27-6/30
Togo 11/16-11/17
Tokelau 3/28-3/29
Tonga 5/8-5/10
Tunisia 11/16-11/23
Turkey 7/11-7/12
Turkmenistan 11/28-11/30
Tuvalu 3/15-3/22
Uganda 10/6-10/9
Ukraine 9/28-9/29
Uruguay 7/1-7/6
Uzbekistan 2/26-3/4
Vanuatu 8/15-8/21
Yemen 6/24-6/29
Zambia 1/27-2/3
Zimbabwe 10/29-11/5
"""
 
a=[]
b=[]
tickets.split(/\n/).each {|t|
	t = t.split(/\s|-/);
	if (t.length >= 3) then
		t[1] = t[1].split(/\//)
		from = t[1][0].rjust(2,"0") + t[1][1].rjust(2,"0")
		t[2] = t[2].split(/\//)
		to = t[2][0].rjust(2,"0") + t[2][1].rjust(2,"0")
		a.push({"name" => t[0],"from" => from,"to" => to})
	end
}
 
a = a.sort {|x, y| y["to"] <=> x["to"] }
 
def nodup(x,y)
	return (y['from'] < x['from'] && y['to'] < x['from']) || (x['to'] < y['from'] && x['to'] < y['to'])
end
 
def getMaxTickets(target, tickets)
	max = []
	tickets.each {|t|
		if (nodup(t[0], target) && max.length < t.length) then
			max = t
		end
	}
	return max
end
 
a.each{|t|
    c=[]
    c.push(t)
    c += getMaxTickets(t,b)
    b.push(c)
}
 
b = b.sort {|x, y| y.size <=> x.size }
d = b[0].sort {|x, y| x['name'] <=> y['name'] }
 
print d.size
d.each{|s| print " " + s['name']}