#define _CRT_SECURE_NO_DEPRECATE
#include <iostream> 
#include <string>
#include <vector>
#include <sstream>
#include <queue>
#include <algorithm>
#include <iomanip>
#include <map>
#include <set>
#include <math.h>
#include <stack>
#include <deque>
#include <numeric>
#include <cstring>
#include <cstdio>
#include <cstdlib>
#include <bitset>
#define mpair make_pair
#define all(v) v.begin(),v.end()
using namespace std;
typedef long long ll;
typedef long double ld;
const ld epsylon = 1e-9;
string from;
string to;
string cc;
string bcc;
string attachment;
string subject;
string body;

bool empty(const string& s) {
	for (int i = 0; i < (int)s.size();++i){
		if (s[i] != ' ' && s[i] != '\n' && s[i] != '\r') {
			return false;
		}
	}
	return true;
}

//bool empty(const string& s) {
//	for (int i = 0; i < s.size();++i){
//		if (s[i] != ' ' && s[i] != '\n' && s[i] != '\r') {
//			return false;
//		}
//	}
//	return true;
//}

bool verify_mail(const string& s){
	if (empty(s)) {
		return true;
	}
	if (s[0] == '@' || s[0] == '.') {
		return false;
	}
	int n = (int)s.size() - 1;
	if (s[n] == '@' || s[n] == '.') {
		return false;
	}
	int numa = 0 ;
	int posa = -1;

	for (int i = 0; i < (int)s.size();++i){
		if (s[i] == '@'){
			numa++;
			posa = i;
		}
	}
	if (numa != 1) {
		return false;
	}
	if (s[posa - 1] == '.' || s[posa + 1 ] == '.') {
		return false;
	}
	bool has = false;
	for (int j = posa+ 1; j <(int)s.size();++j) {
		if (s[j] == '.') {
			has = true;
			break;
		}
	}
	if (!has) {
		return false;
	}
	for (int i=1;i<n;++i){
		if (s[i] == '.' && (s[i-1] == '.' || s[i+1] == '.')) {
			return false;
		}
	}
	return true;
}

bool nl(const char c) {
	return c == '\n' || c == '\r';
}

bool verify_email_list(string s) {
	for (int i=0;i<(int)s.size();++i) {
		if (s[i] == ',') {
			s[i] = ' ';
		}
	}
	istringstream in(s);
	string temp;
	while (in >> temp) {
		if (!verify_mail(temp)) {
			return false;
		}
	}
	return true;
}
bool valid_body(const string& s) {
	for (int i=1;i < (int)s.size();++i){
		if (s[i] == ' ' && nl(s[i-1])) {
			return false;
		}
		if (nl(s[i]) && s[i-1] == ' ') {
			return false;
		}
		if (s[i] == ' ' && s[i - 1] == ' ') {
			return false;
		}
	}
	for (int i = 0; i + 2 < (int)s.size();i++){
		if (nl(s[i]) && nl(s[i+1]) && nl(s[i+2])) {
			return false;
		}
	}
	return true;
}

bool empty_attach(const string& s) {
	for (int i=0;i+5<(int)s.size();++i){
		if (s[i] == 'a' && s[i+1] == 't' && s[i+2] == 't' && s[i+3] == 'a' && s[i+4] == 'c' && s[i+5] == 'h') {
			if (empty(s.substr(i+6, s.size()))) {
				return true;
			}
		}
	}
	return false;
}

int get_error() {
	if (empty(from)) {
		return 1;	
	}
	if (empty(to) && empty(bcc) && empty(cc)) {
		return 2;
	}
	if (!verify_email_list(from) || !verify_email_list(to) || !verify_email_list(cc) || !verify_email_list(bcc)) {
		return 3;
	}
	if (empty(subject)) {
		return 100;
	}
	if (empty(body)){
		return 101;
	}
	if (!valid_body(body)) {
		return 102;
	}
	if (empty_attach(body)) {
		return 103;
	}
	return 0;
}
int main()
{
	freopen("email.in","r",stdin);
	freopen("email.out","w",stdout);
	string temp;
	while (getline(cin, temp)) {
		istringstream in(temp);
		string type;
		in >> temp;
		if (temp == "from:") {
			getline (in, from);
		} else if (temp == "to:") {
			//parse_to(temp, to);
			getline (in, to);

		} else if (temp == "cc:"){
			getline(in, cc);
			//parse_to(temp, cc);
		} else if (temp == "bcc:"){
			//parse_to(temp, bcc);
			getline(in, bcc);
		} else if (temp == "attachment:") {
			getline(in, attachment);
			if (attachment.size() != 0) {
				while (getline(cin, temp)) {
					if (temp.size() == 0) {
						break;
					}
					attachment += "\n" + temp;
				}
			}
		} else if (temp == "subject:") {
			getline(in, subject);
		}else if (temp == "body:") {
			getline(in, temp);
			if (temp.size() > 0 && temp[0] == ' ') {
				temp = temp.substr(1, temp.size());
			}
			if (temp != "----"){
				body =temp;
				while (getline(cin, temp)) {
					if (temp == "----") {
						break;
					}
					body += "\n" + temp;
				}
			}
		}
	}
	cout << get_error() << '\n';
	return 0;
}