#include <fstream>
#include <cstring>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int K,i,j,k,S;
char s[20056], cuv[1001][206], *p;
int main()
{
    f.getline(s, 256);
    K=0;
    p=strtok(s," !@*()_+[]\;':-?.,");
    while(p) {
        K++;
        strcpy(cuv[K],p);
        p=strtok(NULL, " !@*()_+[]\;':-?.,");
    }
    S=0;
    for(i=1;i<=K;i++)  {
        S+=strlen(cuv[i]);
    }
    g<<S/K;
    return 0;
}