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

using namespace std;


int main(){
    ifstream fin("text.in");
    ofstream fout("text.out");
    char s[255];
    fin.get(s,255);
    fin.get();
    int n=strlen(s);
    int lt=0,nc=0,margines=0,margined=0,l=0;
    for(int i=0;i<=n-1;i++){
        if((s[i]>='a' && s[i]<='z') ||(s[i]>='A'&& s[i]<='Z')){
            margines=i;
            break;
        } 
    }
    for(int i=n-1;i>=0;i--){
        if((s[i]>='a' && s[i]<='z') ||(s[i]>='A'&& s[i]<='Z')){
            margined=i;
            break;
        } 
    }
    for(int i=0;i<=n-1;i++){
        if(s[i]=='-' || s[i]==',' || s[i]==' ' || s[i]=='!' || s[i]=='?' || s[i]=='.')l++;
        else lt++;
    }
    for(int i=margines;i<=margined;i++){
        if(s[i]=='-' || s[i]==',' || s[i]==' ' || s[i]=='!' || s[i]=='?' || s[i]=='.')nc++;
    }
    fout<<lt/nc;
    fin.close();
    fout.close();
    return 0;
}