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#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
char c;
long long n,i;
int main()
{
long long suma=0;
long long nr=0;
int ok;
fin>>c;
while(!fin.eof())
{
if((c>='a' && c<='z') || (c>='A' && c<='Z'))
{
++suma;
ok=1;
}
else
{
if(ok)
{
nr++;
ok=0;
}
}
fin>>c;
}
if(nr)
fout<<suma/nr;
else
fout<<0;
}