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#include<fstream>
#include<string>
using namespace std;
int n, i, L, nr, lg;
string s;
ifstream fin("text.in");
ofstream fout("text.out");
int main(){
getline(fin, s);
n = s.length();
for(i = 0; i < n; i++){
if((s[i] >= 'a' && s[i] <= 'z') || (s[i] >= 'A' && s[i] <= 'Z')){
lg++;
}
else{
L += lg;
if(lg > 0){
nr++;
}
lg = 0;
}
}
if(nr != 0){
fout<< L / nr <<"\n";
}
else{
fout<<"0\n";
}
return 0;
}