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#include<bits/stdc++.h>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
string s;
long long lit=0,cuv=0,i;
int main()
{
getline(fin,s);
for(i=0;i<s.length();i++)
{
if(((int(s[i])>=97)&&(int(s[i])<=127))||((int(s[i])>=65)&&(int(s[i])<=90)))
{
lit++;
}
}
for(i=0;i<s.length();i++)
{
if((s[i]==' ')||((s[i]=='-')&&(s[i+1]!=' ')))
{
cuv++;
}
}
fout<<lit/cuv;
return 0;
}