#include <iostream>
#include <cstring>
#include <fstream>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
char s[10001];
int main()
{
    int lgt=0,nct=0,i=0;
    fin.getline(s,1000);
    int n=strlen(s);
    while(!((s[i]>='A' && s[i]<='Z') || (s[i]>='a' && s[i]<='z')))
    i++;
    while(i<n)
    {
        if(((s[i]>='A' && s[i]<='Z') || (s[i]>='a' && s[i]<='z')))
        {
            while(((s[i]>='A' && s[i]<='Z') || (s[i]>='a' && s[i]<='z')) && (i<n))
        {
            lgt++;
            i++;
        }
        nct++;
        }
        while(!((s[i]>='A' && s[i]<='Z') || (s[i]>='a' && s[i]<='z')))
            i++;
    }

    fout<<lgt/nct;
    return 0;
}