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using namespace std;
#include<iostream>
#include<cstring>
#include<cctype>
#include<fstream>
int main()
{
int k=0,n,i,rez,m;
char vec[99999][20];
fstream fis("text.in",ios::in);
do
{
k++;
fis>>vec[k];
}
while(!fis.eof());
fis.close();
n=k-1;
k=0;
for(i=1;i<=n;i++)k=k+strlen(vec[i]);
m=n+1;
for(i=1;i<=n;i++)
{
n=strlen(vec[i]);
if(vec[i][n-1]=='!')m++;
if(vec[i][n-1]=='?')m++;
if(vec[i][n-1]=='.')m++;
}
rez=k/m;
fstream fiss("text.out",ios::out);
fiss<<rez;
fiss.close();
}