#include<bits/stdc++.h>
using namespace std;
ifstream in("text.in");
ofstream out("text.out");

inline int litera(char c)
{   if(c>='a' && c<='z' ) return 1;
    if(c>='A' && c<='Z' ) return 1;
    return 0;
    }

char a,b;
int l,nc;

int main(){
a=' ';
while(in.get(b))
{ if(litera(b)) l++;
    else if(litera(a))nc++;
a=b;
}
    if(!nc) out<<0<<"\n";
        else
    out<<l/nc<<"\n";
in.close();
out.close();
return 0;}