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#include<string>
#include<fstream>
#include<cstring>
using namespace std;
int main(void)
{
char a[100];const char *sep=" .,?;'";
int l=0,c=0,i;
ifstream f("text.in");
f.get(a,100);
f.close();
for(i=0;i<strlen(a);i++)
{
if(isalpha(a[i]))
{
l++;
if(strchr(sep,a[i+1]))
c++;
}
}
ofstream g("text.out");
g<<l/c;
g.close();
return 0;
}