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#include <fstream>
#include <cstring>
#include <cstdio>
using namespace std;
//FILE *fin=fopen("text.in","r")
ifstream fin("text.in");
ofstream fout("text.out");
long long i,l,k,nr;
char s[999999];
int main()
{
fin.getline(s,999999);
nr=0;l=0;k=0;
for(i=0;s[i]!=0;i++)
{
if((s[i]>='a'&&s[i]<='z')||(s[i]>='A'&&s[i]<='Z'))
{
l++;
if(strchr("abcdefghijklmnopqrstuvwzyxABCDEFGHIJKLMNOPQRSTUVWXYZ",s[i+1])==0)
{
k++;
nr+=l;
l=0;
}
}
}
if(k!=0)
fout<<nr/k;
return 0;
}