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#include <iostream>
#include <fstream>
using namespace std;
ifstream in("text.in");
ofstream out("text.out");
int main(){
char c;
int k=0,p=0,ok=0;
while(!in.eof()){
in.get(c);
ok=0;
if((c>='a' && c<='z')||(c>='A' && c<='Z')){
ok=1;
k++;
}
while(!in.eof() && (c>=65 && c<=90) || (c>=97 && c<=122)){
in.get(c);
if((c>='a' && c<='z')||(c>='A' && c<='Z')){
k++;
}
}
if(ok==1)p++;
}
out<<k/p;
return 0;
}