#include <fstream>
#include <cstring>
#include <cstdio>
using namespace std;
//FILE *fin=fopen("text.in","r")
ifstream fin("text.in");
ofstream fout("text.out");
long long i,l,k,nr;
char s[999999],c;
int main()
{
    fin.getline(s,999999);
    nr=0;l=0;k=0;
    for(i=0;s[i]!=0;i++)
    {
        if((s[i]>='a'&&s[i]<='z')||(s[i]>='A'&&s[i]<='Z'))
               l++;
         else if((c>='a'&&c<='z')||(c>='A'&&c<='Z'))
                k++;
         c=s[i];

    }
    nr=strlen(s);
    if((s[nr]>='a'&&s[nr]<='z')||(s[nr]>='A'&&s[nr]<='Z')) k++;
    if(k!=0)
    fout<<l/k;
    else fout<<0;

    return 0;
}