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#include <fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
bool litera(char x)
{
return x>='A'&&x<='Z'||x>='a'&&x<='z';
}
int s,secv;
int main()
{char x,y;
x=';';
while(f.get(y))
{
if(!litera(x)&&litera(y))
{
secv++;
}
if(litera(y)==true)
{
s++;
}
x=y;
}
//g<<secv<<" "<<s<<"\n";
g<<s/secv;
f.close();
g.close();
return 0;
}