#include <iostream>
#include <fstream>
#include <cstring>
#include <cctype>

using namespace std;
char a[1100010];
int main()
{
    ifstream fin("text.in");
    ofstream fout("text.out");
    int i;
    fin.get(a,1100000);
    int n=strlen(a);
    int s=0,k=0;
    i=0;
    while(i<n)
    {
        if(isalpha(a[i]))
        {
            k++;
            while(isalpha(a[i]))
            {
                s++;
                i++;
            }
        }
        else
            i++;
    }
    fout<<s/k;
    return 0;
}