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#include <iostream>
#include <cstring>
#include <fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int main()
{
char s[1000001];
int ctLit=0,ctcuv=0,ok=1,pozi;
f.get(s,1000001);
char sep[]=" -,!?";
for(int i=0; i<strlen(s); i++)
if(isalnum(s[i]))
ctLit++;
char * p = strtok(s , sep);
while(p != NULL)
{
ctcuv++;
p = strtok(NULL , sep);
}
//cout<<ctLit<<" "<<ctcuv<<endl;
// cout<<ctLit<<" "<<ctcuv;
g<<ctLit/ctcuv;
return 0;
}