#include <bits/stdc++.h>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
char s[1000001];
int i,n,cuv,t;
int main()
{
    fin.getline(s,1000001);
    n=strlen(s);
    while(i<n)
    {
        while(i<n&&!isalnum(s[i]))i++;
        if(i==n)break;
        while(i<n&&isalnum(s[i]))
        {
            i++;
            t++;
        }
        cuv++;
    }
    fout<<t/cuv<<'\n';
    return 0;
}