#include <fstream>
#include<cstring>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char s[101],*p,a[101][101];
unsigned int k,q,i;
int main()
{
    f.get(s,101);
    p=strtok(s," ,.!?");
    while(p)
    {
        strcpy(a[k++],p);
        p=strtok(0," ,.!?");
    }
    for(i=1;i<=k;i++)
    q+=strlen(a[i]);
     g<<q/k;
     return 0;
}