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#include <fstream>
#include<cstring>
#define LUN 1500000
using namespace std;
int main()
{
ifstream f("text.in");
ofstream g("text.out");
char s[LUN];
f.get(s,LUN);
int n=strlen(s),nrcuv=0,nrlit=0,k,i;
for(i=0;i<n;i++)
{
if((s[i]>='a'&&s[i]<='z')||(s[i]>='A'&&s[i]<='Z'))
{
nrlit++;
k=0;
}
else
if(k==0)
{
nrcuv++;
k=1;
}
}
if(nrcuv==0)
g<<0;
else
g<<nrlit/nrcuv;
f.close();
g.close();
return 0;
}