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#include<fstream>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
char a[1024*1024+5],*p;
int nrlit,nrcuv;
bool ok;
int main()
{
while (fin.getline(a,sizeof(a)))
{
for (p=a;*p;++p)
if (('a'<=*p && *p<='z') || ('A'<=*p && *p<='Z'))
ok=true, ++nrlit;
else if (ok)
ok=false, ++nrcuv;
if (ok) ++nrcuv, ok=false;
}
fout<<nrlit/nrcuv<<"\n";
return 0;
}