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#include<fstream>
#include<cstring>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
char s[1200000];
int litera(char c)
{
if('a'<=c && c<='z')
return 1;
if('A'<=c && c<='Z')
return 1;
return 0;
}
int main()
{
int i, n, nrcuv, nrlit;
fin.getline(s,1200000);
n=strlen(s);
nrlit=0; nrcuv=0;
if (litera (s[0])==1) nrlit++;
for(i=1;i<n;i++)
{
if(litera(s[i])==1)
nrlit++;
if(litera(s[i-1])==1 && litera(s[i])==0)
nrcuv++;
}
if(litera(s[n-1])==1)
nrcuv++;
//if (nrcuv==0) fout<<0<<'\n';
/*else*/ fout<<nrlit/nrcuv<<'\n';
return 0;
}