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#include <fstream>
#include <cstring>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
long long i,l,k,nr;
char s[999999999];
int main()
{
fin.getline(s,999999999);
nr=0;
for(i=0;i<strlen(s);i++)
{
if(strchr("abcdefghijklmnopqrstuvwzyxABCDEFGHIJKLMNOPQRSTUVWXYZ",s[i])!=0)
l++;
else
{
if(l!=0)
{
nr=nr+l;
k++;
l=0;
}
}
}
fout<<nr/k;
return 0;
}