#include <iostream>
#include <fstream>
#include <string>
using namespace std;

int main()
{
	ifstream in;
	ofstream out;

	string from;
	string to;
	string bcc;
	string cc;
//	string attachment;
	string subject;
	string body;
	string trash;
	string end="----";
	string::iterator it;

	in.open("email.in");
	if(in==NULL)
	{
		cout<<"Cannot open file!"<<endl;
		return -1;
	}

	out.open("email.out");
	if(out==NULL)
	{
		cout<<"Cannot open file!"<<endl;
		return -2;
	}

	in>>trash;
	char chfrom;
	in.get(chfrom);
	if(chfrom=='\n'|| chfrom==' ')
	{
		cout<<"1"<<endl;
		out<<"1"<<endl;
		return 0;
	}
	else
	{
		in.get(chfrom);
		if(chfrom=='\n' || chfrom==' ')
		{
			cout<<"1"<<endl;
			out<<"1"<<endl;
			return 0;
		}
		else
		in>>from;
	}

	it=from.begin();
	while(it!=from.end())
	{
		if((*it)>'A' || (*it)<'Z')
		{
			cout<<"3";
			out<<"3";
			return 0;
		}
		it++;
	}
	if(from[2]=='\n')
	{
		cout<<"1"<<endl;
		out<<"1"<<end;
		return 0;
	}
	int p=from.size();
	if(from[2]=='@' || (from[p]!=',') || (from[p]!='.') || (from[p]!='!') || (from[p]!='?') || from[2]!='.' || from[2]!='!' || from[2]!='?')
	{
		cout<<"3"<<endl;
		out<<"3"<<endl;
		return 0;
	}
	if(from.find('.')==(from.find('@')-1) || from.find('.')==(from.find('@')+1))
	{
		cout<<"3"<<endl;
		out<<"3"<<endl;
		return 0;
	}
	if(from.find('@')>=(from.rfind('.')-1))
	{
		cout<<"3"<<endl;
		out<<"3"<<endl;
		return 0;
	}

	trash.erase();
	in>>trash;
	int second=0, second1=0;
	char chto;
	in.get(chto);
	if(chto=='\n')
	{
		second=1;
	}
	else
	{
		in.get(chto);
		if(chto=='\n' || chto==' ')
		{
			second1=1;
		}
		else
		in>>to;
	}
	it=to.begin();
	while(it!=to.end())
	{
		if((*it)>'A' || (*it)<'Z')
		{
			cout<<"3";
			out<<"3";
			return 0;
		}
		it++;
	}
	p=to.size();
	if(to[2]=='@' || (to[p]!=',') || (to[p]!='.') || (to[p]!='!') || (to[p]!='?') || to[2]!='.' || to[2]!='!' || to[2]!='?')
	{
		cout<<"3"<<endl;
		out<<"3"<<endl;
		return 0;
	}
	if(to.find('.')==(to.find('@')-1) || to.find('.')==(to.find('@')+1))
	{
		cout<<"3"<<endl;
		out<<"3"<<endl;
		return 0;
	}
	if(to.find('@')>=(to.rfind('.')-1))
	{
		cout<<"3"<<endl;
		out<<"3"<<endl;
		return 0;
	}

	trash.erase();
	in>>trash;
	int third=0, third1=0;
	char chbcc;
	in.get(chbcc);
	if(chbcc=='\n')
	{
		third=1;
	}
	else
	{
		in.get(chbcc);
		if(chbcc=='\n' || chbcc==' ')
		{
			third1=1;
		}
		else
		in>>bcc;
	}
	it=bcc.begin();
	while(it!=bcc.end())
	{
		if((*it)>'A' || (*it)<'Z')
		{
			cout<<"3";
			out<<"3";
			return 0;
		}
		it++;
	}
	p=bcc.size();
	if(bcc[2]=='@' || (bcc[p]!=',') || (bcc[p]!='.') || (bcc[p]!='!') || (bcc[p]!='?') || bcc[2]!='.' || bcc[2]!='!' || bcc[2]!='?')
	{
		cout<<"3"<<endl;
		out<<"3"<<endl;
		return 0;
	}
	if(bcc.find('.')==(bcc.find('@')-1) || bcc.find('.')==(bcc.find('@')+1))
	{
		cout<<"3"<<endl;
		out<<"3"<<endl;
		return 0;
	}
	if(bcc.find('@')>=(bcc.rfind('.')-1))
	{
		cout<<"3"<<endl;
		out<<"3"<<endl;
		return 0;
	}

	trash.erase();;
	in>>trash>>cc;
	int four=0, four1=0;;
	char chcc;
	in.get(chcc);
	if(chcc=='\n')
	{
		four=1;
	}
	else
	{
		in.get(chcc);
		if(chcc=='\n' || chcc==' ')
		{
			four1=1;
		}
		else
		in>>cc;
	}
	if(second==1 && second1==1 && third==1 && third1==1 && four==1 && four1==1)
	{
		out<<"2"<<endl;
		cout<<"2"<<endl;
		return 0;
	}
	it=cc.begin();
	while(it!=bcc.end())
	{
		if((*it)>'A' || (*it)<'Z')
		{
			cout<<"3";
			out<<"3";
			return 0;
		}
		it++;
	}
	if(bcc[2]=='\n' || cc[2]=='\n' || to[2]=='\n')
	{
		cout<<"3"<<endl;
		out<<"3"<<end;
		return 0;
	}
	p=bcc.size();
	if(bcc[2]=='@' || (bcc[p]!=',') || (bcc[p]='.') || (bcc[p]!='!') || (bcc[p]!='?') || bcc[2]!='.' || bcc[2]!='!' || bcc[2]!='?')
	{
		cout<<"3"<<endl;
		out<<"3"<<endl;
		return 0;
	}
	if(bcc.find('.')==(bcc.find('@')-1) || bcc.find('.')==(bcc.find('@')+1))
	{
		cout<<"3"<<endl;
		out<<"3"<<endl;
		return 0;
	}
	if(bcc.find('@')>=(bcc.rfind('.')-1))
	{
		cout<<"3"<<endl;
		out<<"3"<<endl;
		return 0;
	}

	trash.erase();
	in>>trash;
	char ch;
	do
	{
		in>>ch;
	}while(ch!=' ');

	trash.erase();
	in>>trash>>subject;
	it=subject.begin();
	int flag=0;
	while(it!=subject.end())
	{
		if((*it)>' ')
			flag=1;
		it++;
	}
	if(flag==0)
	{
		cout<<"100";
		out<<"100";
		return 0;
	}

	trash.erase();
	in>>trash;
	do
	{
		in>>body;
		it=body.begin();
		flag=0;
		while(it!=body.end())
		{
			if((*it)>' ')
				flag=1;
			it++;
		}
		if(flag==0)
		{
			cout<<"101";
			out<<"101";
			return 0;
		}
		it=body.begin();
		while(it!=body.end())
		{
			if((*it)==' ' && *(it++)==' ')
			{
				cout<<"101";
				out<<"101";
				return 0;
			}
			it++;
		}

	}
	while(body!=end);
	
	return 0;
}