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#include <bits/stdc++.h>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int len,cnt,no;
string s;
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(NULL);
getline(f,s);
for(int i=0; i<s.size(); i++)
if(('a'<=s[i] && s[i]<='z') || ('A'<=s[i] && s[i]<='Z'))
cnt++;
else
{
if(cnt)
{
len+=cnt;
no++;
}
cnt=0;
}
if(cnt)
{
len+=cnt;
no++;
}
g<<len/no;
return 0;
}