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#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
char s[2000100];
long long n,i;
int main()
{
fin.getline(s,2000100);
n = strlen(s);
long long suma=0;
long long nr=0;
for(i=0; i<n; ++i)
{
if((s[i]>='a' && s[i]<='z') || (s[i]>='A' && s[i]<='Z'))
{
++nr;
++i;
++suma;
while((s[i]>='a' && s[i]<='z') || (s[i]>='A' && s[i]<='Z'))
{
++suma;
++i;
}
--i;
}
}
if(nr)
fout<<suma/nr;
else
fout<<0;
}