#include <fstream>
#include <cstring>
using namespace std;
int nr=0,lg=0;
char s[10000],q[10000] ,*p;
ifstream f("text.in");
ofstream g("text.out");
int main()
{
    f.getline(s,10000);
    strcpy(q,s);
    p=strtok(s," ");
    for(int i=0;i<strlen(q);i++)
    {
        if((q[i]>='a' && q[i]<='z') || (q[i]>='A' && q[i]<='Z') || (q[i]=='-' && q[i+1]!=' '))
            lg++;
    }
    while(p!=NULL)
    {
        nr++;
        p=strtok(NULL," ");
    }
    g<<lg/nr;
    return 0;
}