#include <iostream>
#include <string.h>
#include <fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");

int main()
{
    int i=0,lungime=0,cuv=0;
    char sir[100];
    f.get(sir,99);
    while(i<=strlen(sir))
    {
        if(sir[i]>='A' && sir[i] <= 'Z' || sir[i] >= 'a' && sir[i] <= 'z')
            lungime++;
            if(sir[i] == '\0')
                cuv++;
            if(sir[i] == ' ')
                cuv++;
        if((sir[i] == '-' &&(sir[i-1]>='A' && sir[i-1] <= 'Z' || sir[i-1] >= 'a' && sir[i-1] <= 'z')))
            cuv++;
        i++;
    }
    g<<lungime/cuv;
    return 0;
}