#include <bits/stdc++.h>

using namespace std;

ifstream fin("text.in");
ofstream fout("text.out");

unsigned long long ltotal, nrc;
char s[400005];

int main()
{
    int i, l;
    fin.getline(s,sizeof(s));
    l=strlen(s);
    for(i=0; i<l; i++)
        if(isalpha(s[i]))
        {
            nrc++;
            while(isalpha(s[i]))
            {
                ltotal++;
                i++;
            }
        }
    fout<<ltotal/nrc<<'\n';
    return 0;
}