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

using namespace std;

int main(){
    ifstream f("text.in");
    ofstream g("text.out");

    char s[100000],*p;
    int sum=0,nr=0,i,al=0;

    f.get(s,100000);
    i=0;
    while(s[i]){
        if(isalpha(s[i]))
            al++;
        while(isalpha(s[i]))
        {
            nr++;i++;
        }
        i++;

    }

    g<<nr/al;


    return 0;
}