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#include <bits/stdc++.h>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
string s;
int nr,nr1,n,i;
void verif()
{
for(i=0; i<=n; i++)
{
if(isalpha(s[i])==false)
{
s[i]=' ';
nr++;
}
}
}
void separarecuv()
{
string w;
stringstream iss(s);
while(iss>>w)
{
nr1++;
}
if (nr1)fout<<(n-nr)/nr1;
else fout<<n-nr;
}
int main()
{
getline(fin,s);
n=s.size();
verif();
separarecuv();
return 0;
}