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#include <fstream>
#include <cstring>
using namespace std;
char a[300005];
int n,num,numcuv;
void Read(){
ifstream fin("text.in");
fin.getline(a,300005);
n=strlen(a);
fin.close();
}
int Litera(char ch){
if((ch>='a' && ch<='z') || (ch>='A'&&ch<='Z'))
return 1;
return 0;
}
void solve(){
int i;
for(i = 2; i < n; i++)
{
if(Litera(a[i]))
{
num++;
if(!Litera(a[i+1]))
numcuv++;
}
}
}
void Afisare(){
ofstream fout("text.out");
fout << num/numcuv<<"\n";
fout.close();
}
int main(){
Read();
solve();
Afisare();
return 0;
}