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#include<bits/stdc++.h>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char s[8000003];
int main()
{
int n,nrcuv;
f.getline(s,8000002);
n=0;
nrcuv=0;
for(int i=0;i<strlen(s);i++){
if(isalpha(s[i])){
n++;
if(!isalpha(s[i-1]))
nrcuv++;
}
}
if(nrcuv==0)
g<<0<<'\n';
else
g<<n/nrcuv<<'\n';
f.close();
g.close();
return 0;
}