#include <iostream>
#include <cstdio>
#include <cstring>
using namespace std;
char s[1024*1024+10];
int main()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);

    gets(s);
    int nrc=0,nrcuv=0,i,n=strlen(s);
   char e[]=" ,.!?;:(){}[]/\-""!\@#$%^&*_+<>|'`~1234567890";
    for(i=0;i<n;i++)
        if((s[i]>='a'&&s[i]<='z')||(s[i]>='A'&&s[i]<='Z'))
            nrc++;
    for(i=0;i<n;i++)
        if(strchr(e,s[i])&&((s[i-1]>='a'&&s[i-1]<='z')||(s[i-1]>='A'&&s[i-1]<='Z')))
            nrcuv++;
            //cout<<nrc<<endl<<nrcuv<<endl;
    if(nrcuv)
        cout<<nrc/nrcuv;
        else
    cout<<0;
    return 0;
}