#include<cstdio>
using namespace std;
FILE *f,*g;
int nrl,nrc,ok;
char c;
int main()
{f=fopen("text.in","r");
g=fopen("text.out","w");
fscanf(f,"%c",&c);
nrc=0;
nrl=0;
ok=0;
while(c!='\n')
{if((c>=65&&c<=90)||(c>=97&&c<=122))
{nrl++;
if(ok==0)
{ok=1;
nrc++;
}
}
else
	ok=0;
fscanf(f,"%c",&c);
}
fprintf(g,"%d",nrl/nrc);
fclose(f);
fclose(g);
return 0;
}