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#include <iostream>
#include <cstring>
#include <fstream>
using namespace std;
ifstream fin ("text.in");
ofstream fout ("text.out");
int main (void)
{
char a[1000000];
int s=0,s1=0,s2=0,l,p=1;
while(p>0)
{
fin>>a;
l=strlen(a);
s=s+l;
if(a[l-1]==33 ||a[l-1]==46 || a[l-1]==63)
break;
}
s2=s;
int i;
fin.close();
ifstream fin ("text.in");
for(i=0;i<s;i)
{
fin>>a;
l=strlen(a);
i=i+l;
s1++;
for(int j=0;j<l;j++)
if(a[j]==33 ||a[j]==46 || a[j]==63)
s2--;
else
if(a[j]==45 || a[j]==46 ||a[j]==44)
s2--;
}
int k;
k=s2/s1;
fout<<k;
return 0;
}