#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
int main()
{
    char s[1000000];
    int ap=0, suma= 0,i,med;
    while(fin.get(s))
    {for(i=0; s[i]; i++)
    {
    while((s[i]>='a' && s[i]<='z') || (s[i]>='A' && s[i]<='Z'))
    {
        suma++; i++;
    }
    if(i>0)
    {
    if((s[i-1]>='a' && s[i-1]<='z') || (s[i-1]>='A' && s[i-1]<='Z'))
    ap++;
    }
    }
    med=suma/ap;
    fout<<med;
    }
}