#include <bits/stdc++.h>

using namespace std;

ifstream in ( "text.in" );
ofstream out ( "text.out" );
char v[] = "qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM";
bool ok = false;
int main()
{
    char s[255];
    in.getline(s,255);

    int nrcuv=0;
    int lgtotal=0;

for ( int i = 0 ; i < strlen(s) ; ++i )
    if(strchr(v,s[i])!=0) lgtotal++;


 for ( int i = 0 ; i < strlen(s) ; ++i )
    if(strchr(v,s[i])==0) ok=false;
     else {
            while (strchr(v,s[i])!=0) i++;
              nrcuv++;

           }

           out <<lgtotal/nrcuv;

           return 0;
}