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#include <fstream>
#include <cstring>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
int main()
{
char s[201];
int x=0,y=0;
fin.getline(s,201);
for(int i=0;i<strlen(s)-1;i++)
{
if(s[i]==' ' || (s[i]=='-' && ((s[i-1]!=' '&&i-1>=0))))
{
y++;
}
else
{
if(s[i]-'0'>=32 && s[i]-'0'<=126)
x++;
}
}
fout<<x/y;
return 0;
}