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#include <fstream>
using namespace std;
ifstream f ("text.in");
ofstream g ("text.out");
int i,k,c,sw;
char s,ch;
int main()
{
while (f.get(s))
{
if ((s>='A'&&s<='Z')||(s>='a'&&s<='z')) k++;
else if ((ch>='A'&&ch<='Z')||(ch>='a'&&ch<='z')) c++;
ch=s;
}
if ((s>='A'&&s<='Z')||(s>='a'&&s<='z'))
c++;
if (c!=0)
g<<k/c;
else g<<0;
return 0;
}