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#include <fstream>
#include <cstring>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
char s[10001];
int lg, nrcuv, nr, ind, i;
int main() {
fin.get(s, 10001);
lg = strlen(s);
for(i = 0;i < lg;i++) {
if(('a' <= s[i] && s[i] <= 'z') || ('A' <= s[i] && s[i] <= 'Z')) nr++;
else {
if(ind != i) {
nrcuv++;
}
ind = i + 1;
}
}
//fout << nr << " / " << nrcuv << " = ";
fout << nr / nrcuv << '\n';
fin.close();
fout.close();
return 0;
}