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#include <iostream>
using namespace std;
int main()
{
string word;
bool begin = false, end = false;
unsigned int count = 0;
while(true)
{
cin >> word;
if(cin.eof())
{
break;
}
if(begin && !end)
{
count++;
}
if(word == "beginning")
{
begin = true;
}
else if(word == "end")
{
if(!begin)
{
cout << "wrong sequence" << endl;
return 0;
}
count--;
end = true;
}
}
if(!begin || !end)
{
cout << "wrong sequence" << endl;
return 0;
}
cout << count << endl;
return 0;
}
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