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#include <fstream>
using namespace std;
ifstream in("text.in");
ofstream out("text.out");
long long s, nr;
char c;
int main() {
bool ik = false;
while(in.get(c)) {
if(('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z')) {
ik = true;
s++;
}
else {
if(ik) {
ik = false;
nr++;
}
}
}
if(ik)
nr++;
out << s/nr;
in.close();
out.close();
return 0;
}