#include<cstdio>
using namespace std;
int main()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    int l=0,cuv=0;
    char c;
    bool a=false;
    while(scanf("%c",&c)!=EOF)
    {
        if((c>='a'&&c<='z')||(c>='A'&&c<='Z'))
        {
            l++;
        }
        if(c==' '||c=='-')
        {
            cuv++;
        }
    }
    printf("%d",l/cuv);
    return 0;
}