#include <stdio.h>

const int N=1<<21;
char s[N];
inline bool litera(char c)
{
    return (c>='a' && c<='z') || (c>='A' && c<='Z');
}
int main()
{
	int i,nr=0,ss=0;
	freopen("text.in","r",stdin);
	freopen("text.out","w",stdout);
	fgets(s,N,stdin);
	//if (litera(s[0])) nr++;
    for (i=0;s[i] && s[i]!='\n';++i)
	{
        if (litera(s[i]) && !litera(s[i+1]) )
            ++nr;
		if (litera(s[i])) ss++;
	}
	if(nr==0) 
		printf("0");
	else
		printf("%d",ss/nr);
	return 0;
}