#include<fstream.h>
#include<string.h>
int main()
{ifstream fin("text.in");
char a[100];
int nrl=0,i,nr=0;
fin.getline(a,100);
fin.close();
for(i=1;i<=strlen(a);i++)
{nrl++;
if(a[i]=='-')nrl--;
else if(a[i]==','){nrl--;nr++;}
else if(a[i]=='!'){nrl--;}
else if(a[i]=='?'){nrl--;}
else if(a[i]==';'){nrl--;}
else if(a[i]==' '){nrl--;nr++;}}
ofstream fout("text.out");
cout<<int(nrl/nr);
return 0;}