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#include <iostream>
#include <string.h>
#include <fstream>
using namespace std;
int main()
{
ifstream in("text.in");
ofstream out("text.out");
long int c=0, l=0, ok=0, ne;
char s;
ne=0;
while(ne<2)
{
in.get(s);
if(s=='\n') ne++;
else
if((s>='a' && s<='z') || (s>='A' && s<='Z'))
{
l++;
ok++;
}
else
{
if(ok!=0)
c++;
ok=0;
}
}
if(c) out<<l/c;
return 0;
}