#include <stdio.h>
#include <cstring>
#include <fstream>
#include <string>
#include <vector>
#include <iostream>
#include <algorithm>

using namespace std;

std::string mail;
std::vector<std::string> lines;

bool isLineEmpty(const std::string& line)
{
	for(int i = 0 ; i < line.length(); i++){
		if ( line[i] != ' ' && line[i] != '\n'){
			return false;
		}
	}
	return true;
}

std::string getConentsOf(const std::string& tag)
{
	for(int i = 0 ; i < lines.size(); i++){
		int n = lines[i].find(tag);
		if ( n != std::string::npos ){
			return lines[i].substr(n+tag.length());
		}
	}
	return "";
}

vector<std::string> splitBy(const std::string& string, char splitBy)
{
	vector<std::string> result;

	for(int i = 0; i < string.length(); i++)
	{
		int n = string.find(splitBy, i) ;

		if ( n != std::string::npos){
			result.push_back(string.substr(i, n - i));
			i = n;
		}
		else{
			result.push_back(string.substr(i));
			return result;
		}
	}	

	return result;
}

string trim(const std::string& s)
{
	string res = s;
	while(res.front() == ' '){
		res = res.substr(1);
	}

	while(res.back() == ' '){
		res.pop_back();
	}
	return res;
}

bool isMailValid(const std::string& mail)
{
	if ( isLineEmpty(mail) )
		return true;

	if ( !( mail[0] >= 'a' && mail[0] <= 'z' && mail.back() >= 'a' && mail.back() <= 'z') )
		return false;

	for(int i = 0; i < mail.length();i++){
		if ( !( mail[i] >= 'a' && mail[i] <= 'z') && mail[i] != '.' && mail[i] != '@' )
			return false;
	}

	int i = std::count(mail.begin(), mail.end(), '@');
	if ( i != 1 ){
		return false;
	}
	int n = mail.find('@');
	int n1 = mail.find('.', n);
	if ( n1 == string::npos )
		return false;
	if ( mail.find(".@", n) != string::npos || mail.find("@.", n) != string::npos )
		return false;

	return true;
}

bool areMailsValid(const std::string& mail)
{
	vector<std::string> mails = splitBy(mail, ',');
	for(int i = 0; i < mails.size() ;i++){
		if ( !isMailValid(trim(mails[i])) )
			return false;
	}
	return true;

}

int main()
{
	ifstream in("email.in");

	while(!in.eof() ){
		char line[1024];
		in.getline(line,1024);
		mail += line;
		lines.push_back(line);
	}

	ofstream out("email.out");

	std::string from = getConentsOf("from:");
	std::string to = getConentsOf("to:");
	std::string cc = getConentsOf("cc:");
	std::string bcc = getConentsOf("bcc:");
	std::string subject = getConentsOf("subject:");
	std::string body = getConentsOf("body:");
	std::string attachment = getConentsOf("attachment:");

	if ( isLineEmpty(from) ){
		out << 1 << endl;
	}
	else if( isLineEmpty(to) && isLineEmpty(cc) && isLineEmpty(bcc) )
	{
		out << 2 << endl;
	}
	else if( !isMailValid(trim(from)) || !areMailsValid(to) || !areMailsValid(cc) || !areMailsValid(bcc) )
	{
		out << 3 << endl;
	}
	else if ( isLineEmpty( subject ) ){
		out << 100 << endl;
	}
	else{
		out << 0 << endl;
	}


	return 0;
}