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#include <bits/stdc++.h>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
int n,nr;
string s;
int main(){
while(fin>>s)
{
for(int i=0;i<s.size();i++)
{
if((s[i]>='a' && s[i]<='z') || (s[i]>='A' && s[i]<='Z'))
{
n++;
if(i==0)
nr++;
else
if(!((s[i-1]>='a' && s[i-1]<='z') || (s[i-1]>='A' && s[i-1]<='Z'))) nr++;
}
}
}
fout<<n/nr;
return 0;
}