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#include<fstream>
#include <string>
#include<algorithm>
using namespace std;
string a;
string v[100];
int main()
{
ifstream f("text.in");
ofstream g("text.out");
int i,p=1,c=0,q;
getline(f,a);
//getline(f,a);
for(i=0;i<a.size();++i)
{
q=1;
if((a[i]>='a' && a[i]<='z')||(a[i]>='A' && a[i]<='Z'))
q=0,c++;
if(q==1){
++p;
if(!((a[i+1]>='a' && a[i+1]<='z')||(a[i+1]>='A' && a[i+1]<='Z')))
--p;
}
}
g<<c/p;
}