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#include <fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
string s;
int cont,c;
bool cuv(char a)
{
return ((a<'a' || a>'z') &&(a<'A' || a>'Z'));
}
int main()
{
while(getline(f,s))
{
for(int i=0;i<=s.size();i++)
if(isalpha(s[i]))
cont++;
for(int i=1;i<=s.size();i++)
if(cuv(s[i]) && cuv(s[i-1])==0)
c++;
}
if(c==0 || cont==0)
g<<0;
else
g<<int(float(cont)/c);
return 0;
}