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#include <fstream>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
bool eLitera(char c) {
return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z');
}
string s;
bool cuv;
int nrLit, nrCuv;
int main() {
getline(fin, s);
for(int i = 0; i < s.length(); i++) {
if(s[i] == ' ' || s[i] == '-') {
if(cuv) {
nrCuv++;
}
cuv = false;
} else if(eLitera(s[i])) {
nrLit++;
cuv = true;
}
}
nrCuv++;
fout << (nrLit / nrCuv);
return 0;
}