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#include <iostream>
#include <fstream>
#include <string.h>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
char s[1001];
unsigned i,k,k1;
int main()
{
fin.get(s,1000);
for(i=0;i<strlen(s);i++)
{
if(((s[i]>='a'&&s[i]<='z')||(s[i]>='A'&&s[i]<='Z')))
{k++;
if(strchr(",. !-",s[i+1]))
k1++;
}
}
cout<<k/k1;
return 0;
}