#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;

ifstream in("text.in");
ofstream out("text.out");
int main(){
char s[100001],*p;
long long n,i,ct=0,cti=0;
in.get(s,100001);
p=strtok(s,"!@#$%^&*(){}[]-_=+;:<>,.?/\| ");
while(p!=NULL){
ct++;
n=strlen(p);
for(i=0;i<n;i++)
cti++;
p=strtok(NULL,"!@#$%^&*(){}[]-_=+;:<>,.?/\| ");

}

out<<cti/ct;

return 0;
}