#include<bits/stdc++.h>
using namespace std;
FILE *fin=fopen("text.in","r");
ofstream fout("text.out");

bool verif (char c)
{
    if ((c>='a' &&c<='z')|| (c>='A' &&c<='Z'))
    return 1;
    return 0;
}

int32_t main()
{
    int i,lit=0,cuv=0;
    char c,pred;
    fscanf(fin,"%c",&pred);
    if (verif (pred))
        lit++,cuv++;
    while(fscanf(fin,"%c",&c)!=EOF)
    {
        if (verif(c))
        {
        lit++;
        if (verif(pred)==0)
        cuv++;
        }
        pred=c;
    }
    if (cuv==0)
        fout<<0;
    else    fout<<lit/cuv;
}