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#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
int main()
{
fstream f("text.in");
ofstream g("text.out");
char a[256],sep[]=".,!?1234567890;- ";
long int i,k=0,x=0;
f.getline(a,256);
int n=strlen(a);
for(i=0;i<n;i++)
if(strchr(sep,a[i])==0)k++;
for(i=0;i<n;i++)
if(strchr(sep,a[i])==0){while(strchr(sep,a[i])==0)
i++;
x++;
}
if(x!=0)g<<k/x;
g.close();
}