#include <fstream>
#define endl f2<<"\n";
#define pr f2<<
using namespace std;
ifstream f1 ("text.in");
ofstream f2 ("text.out");


int main(){
    char c;
    int len = 0;
    int cuv = 0;
    int confirm = 0;
    //int n;
    while(f1>>noskipws>>c){
        //n = c;
        if((c >= 65 && c <= 90) ||  (c >= 97 && c <= 122)){
            len++;
            confirm = 1;
        }
        else if(confirm){
            cuv++;
            confirm = 0;
        }
    }
    pr len/cuv ;
    return 0;
}