#include<stdio.h>
#include<stdlib.h>
using namespace std;
char c; int q,cuv,flag=1,m;
int main()
{
    FILE*f=fopen("text.in","r"); FILE*h=fopen("text.out","w");
    while(!feof(f))
    {
        fscanf(f,"%c",&c);
        if((c>95&&c<123)||(c<91&&66<c))
        {
            q++;
            flag=1;
        }
        else
        if((c==32||c==45||c==0)&&flag==1)
        {
            cuv++;
            flag=0;
        }
    }
    m=cuv/q;
    fprintf(h,"%i",m);
    fclose(f); fclose(h);
    return 0;
}