#include <fstream>
#include <cstring>

using namespace std;
char v[100000];
int main()
{
	ifstream cin("text.in");
	ofstream cout("text.out");

    int cnt=0,ok=0,nrl=0;
    cin.getline(v,100000);
    int len=strlen(v);

    for(int i=0;i<len;i++)
	{
		if((v[i]>='a' && v[i]<='z') || (v[i]>='A' && v[i]<='Z'))
		{
			ok=1;
			nrl++;
		}
		if(v[i]=='.' || v[i]==',' || v[i]=='!' || v[i]=='?' || v[i]==' ' || v[i]=='-' || (v[i]>='0' && v[i]<='9'))
		{
			if(ok==1)
			{
				ok=0;
				cnt++;
			}
		}
	}

	if(ok==1)
		cnt++;

	cout<<nrl/cnt;

    return 0;
}