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#include <bits/stdc++.h>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
int ltotal, nrc;
char s[100000500];
int main()
{
int i, l;
fin.getline(s,sizeof(s));
l=strlen(s);
for(i=0; i<l; i++)
if(isalpha(s[i]))
{
nrc++;
while(((s[i]>='a' && s[i]<='z') || (s[i]>='A' && s[i]<='Z')) && i<l)
{
ltotal++;
i++;
}
}
if(nrc!=0)
fout<<ltotal/nrc<<'\n';
else
fout<<0<<'\n';
return 0;
}