#include <stdio.h>
int main()
{ char i,x;
  int ok,cuv=1,car=0,sol,ok2=0;
FILE*f=fopen("text.in","r");
FILE*g=fopen("text.out","w");
while(!feof(f))
	{
	ok=0;
	fscanf(f,"%c",&x);
	if ((x==' ' || x=='-')&& car>1) ok2=0;
	else for (i='a';i<='z';i++)
		if (i==x) {ok=1; break;}
	if (ok==0) for (i='A';i<='Z';++i)
			if(i==x) {ok=1; break;}
	if (ok==1) car++;
	if (ok==1 && ok2==0) { cuv++; ok2=1;}
	}
sol=car/cuv;
fprintf(g,"%d",sol);
return 0;
}