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