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#include <bits/stdc++.h>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
string s;
int x,y,z;
int main(){
getline(fin,s);
while(s[0]){
for(int i=0;i<s.length();i++){
if(('a'<=s[i] && 'z'>=s[i])||('A'<=s[i] && 'Z'>=s[i])) x++;
else {
if(x) y+=x,z++,x=0;
}
}
if(x) y+=x,z++,x=0;
getline(fin,s);
}
if(z) fout << y/z;
else fout << 0;
}