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#include <fstream>
#include <cstring>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
int main()
{
char c;
int nrcuv, lg, nr;
nrcuv = lg = 0;
nr = 0;
while (fin.get(c) && !fin.eof())
if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'))
{
++ lg;
if (!nr) ++ nrcuv;
++ nr;
}
else
nr = 0;
fout << lg / nrcuv << "\n";
fin.close();
fout.close();
return 0;
}