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#include <iostream>
#include <fstream>
#include <cstring>
#define nmax 2000000
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char v[nmax];
long long S,nr;
bool lit(char c)
{
if((c>='a' && c<='z') || (c>='A' && c<='Z'))return 1;
return 0;
}
int main()
{
f.getline(v,nmax);
long long n=strlen(v);
long long l=0;
for(long long i=0;i<n;i++)
{
if(lit(v[i]))
{
l++;
}
else
{
if(l)
{
nr++;
S+=l;
l=0;
}
}
}
if(nr)g<<S/nr;
else g<<0;
return 0;
}