#include<fstream>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
char s[100000],*cuv,v[100000];
int nrcuv,lung;
int main()
{fin.get(s,100000);
cuv=strtok(s," ,.?!-'");
while(cuv)
{
	nrcuv++;
	strcat(v,cuv);
	cuv=strtok(0," ,.?!-'");
}
fout<<(strlen(v)-1)/nrcuv;
return 0;
}