#include <fstream>
#include <cstring>
#define DIM 256
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int main()
{
    char a[DIM];
    char *p;
    int lga,cuv=0,L=0;
    f.get(a,DIM);
    p=strtok(a,"1234567890*{}()[]&%^ ,.""!?-;:''");
    while(p!=NULL){
        lga=strlen(p);
        L=L+lga;
        cuv++;
        p=strtok(NULL,"1234567890*{}()[]&%^ ,.""!?-;:''");
    }
    g<<L/cuv;
    return 0;
}