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#include <iostream>
#include <cstring>
#include <fstream>
using namespace std;
ifstream in("text.in");
ofstream out("text.out");
int main()
{
char t[101],s1[]=" .,?!-:;'_/\";
long long l=0,c=0;
in.getline(t,101);
for(long long i=0; i<strlen(t); i++)
if(strchr(s1,t[i]))
l++;
if(l==strlen(t))
out<<0;
else
{
l=strlen(t)-l;
char *p=strtok(t,s1);
while(p)
{
c++;
p=strtok(NULL,s1);
}
out<<l/c;
}
return 0;
}