#include <bits/stdc++.h>

using namespace std;

ifstream f("text.in");
ofstream g("text.out");

int n,y,m,b,i,j,u,e,o,minn,maxx,k,z,c[1001],a,v[1001][1001],ok=0,d,r,s;
char x[10001],*p,l;

int main()
{

    f.get(x,1001);
    p=strtok(x," ,-!?;:");
    while (p!=0)
    {
        o=strlen(p);
        j=j+o;
        k++;
        p=strtok(NULL," ,-!?;:");
    }
    g<<j/k;
}