#include <iostream>
#include <fstream>
#include <string.h>

using namespace std;

char a,b;
long int c,l;

int main()
{
    ifstream fin("text.in");
    ofstream fout("text.out");
    b='*';
    while(fin.get(a))
    {
        if(((a>=65)&&(a<=90))||((a>=97)&&(a<=122))) l++;
        else if(((b>=65)&&(b<=90))||((b>=97)&&(b<=122))) c++;
        b=a;
    }
    fout<<l/c;
}