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#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
int main()
{
ifstream f("text.in");
ofstream g("text.out");
char a;
int s=0,z=0;
f.get(a);
if((a>='a'&&a<='z')||(a>='A'&&a<='Z'))
s++;
while(!f.eof())
{
char b;
f.get(b);
if((b>='a'&&b<='z')||(b>='A'&&b<='Z'))
{
if(strchr(",.-*!?' ",a))
z++;
s++;
}
a=b;
}
g<<s/z;
return 0;
}