#include <fstream>
#include <cstring>

using namespace std;

char a[100], *p;
int nr, lm, n, i, suma;

int main()
{
    ifstream f("text.in");
    ofstream g("text.out");
    f.get (a,100);
    char sep[]={' ', ',', '!'};
    p = strtok (a,sep);
    while(p)
    {
        n = strlen(p);
        p = strtok (NULL,sep);
        nr++;
    }
    for(i=1; i<=n-1; i++)
        suma = suma + nr;
    lm = suma/nr;
    g << lm;
    return 0;
}