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#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
char s[1000000001];
unsigned long long bec,lg,lgt,nr,m,i,n;
int litera(char x)
{
if((x>='a'&& x<='z') || (x>='A' && x<='Z'))
return 1;
return 0;
}
int main()
{
fin.getline(s,1000000000);
n=strlen(s);
for(i=0; i<n; i++)
{
if(litera(s[i]))
{
bec=1;
lg++;
}
else if(bec==1)
{
nr++;
lgt+=lg;
bec=0;
lg=0;
}
}
if(lg>0)
{
lgt+=lg;
nr++;
}
if(!nr || !lgt)
{
fout<<0;
return 0;
}
unsigned long long m=lgt/nr;
fout<<m;
return 0;
}