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#include <fstream>
#include <cstring>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char s[1200000],*p,sep[200],ch;
int l=0,nr=0;
int main ()
{
for(ch=32;ch<=126;ch++)
if(ch>='a' && ch<='z' || ch>='A' && ch<='Z')
{
sep[l]=ch;
l++;
}
sep[l]=0;
l=0;
f.get(s,1200000);
p=strtok(s,sep);
while (p!=NULL)
{
nr++;
l=l+strlen(p);
p=strtok(NULL,sep);
}
g<<l/nr;
g.close();
return 0;
}