#include <fstream>
#include <string.h>
#include <math.h>

using namespace std;

int main()
{
    unsigned int i,j,k,m;
    char x[100],s[6]={'.',',',' ','!','?','-'};
    ifstream f("text.in");
    ofstream g("text.out");
    k=0;
    m=0;
    f.getline(x,100);
    if(x[0]==' ')
    k=-1;
    for(i=0;i<strlen(x);i++)
    for(j=0;j<6;j++)
     if(x[i]==s[j]&&x[i+1]!=' ')
        k++;
    for(i=0;i<strlen(x);i++)
    if(x[i]>='a'&&x[i]<='z'||x[i]>='A'&&x[i]<='Z')
    m++;
    g<<m/k<<endl;


    return 0;
}