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#include<iostream>
#include<cstring>
#include<fstream>
using namespace std;
int main ()
{ ifstream f("text.in");
ofstream g("text.out");
char a[100],b[]="-?><'~!'()%$*";
f.get(a,100);
int i,s=0,p=1,j;
for(i=0;i<=strlen(a);i++)
{
if(a[i]>='A' && a[i]<='z')
s++;
if(a[i]>0 && a[i+1]==' ')
p++;
for(j=0;j<=12;j++)
if(a[i]==b[j])
s++;
}
cout<<s/p;
g<<s/p;
f.close();
g.close();
return 0;
}