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

using namespace std;
int main(){
    ifstream fin("text.in");
    ofstream fout("text.out");

	char a[1000];
	fin.getline(a,1000);
	int nr=0;
	for(int i=1;i<=strlen(a)-1;i++)
        if((a[i]>='a' && a[i]<='z') || (a[i]>='A' & a[i]<='Z'))
            nr++;

    char *p;
    int c=0;

    p=strtok(a," ");
    while(p!=NULL)
    {
        c++;
        p=strtok(NULL," ");
    }

    fout<<nr/c;

	return 0;
}