#include <bits/stdc++.h>

using namespace std;

int main()
{
    ifstream f("text.in");
    ofstream g("text.out");
    char spatiu[]={' ','-',','},st=0;
    int s1=0,s2=0;
    string n;
    getline(f,n);
    int x=0;
    if (!isalpha(n[x]))
    {
        while (!isalpha(n[x])) {++x;++st;}
    }
    for (int i=st;i<n.size();++i)
    {
        if (isalpha(n[i])) s1++;
        if (!isalpha(n[i]))
        {
            s2++;
            while (!isalpha(n[i])) ++i;
            --i;
        }
    }
    if (s2==0) s2++;
    g<<s1/s2;
    return 0;
}