#include <cstdio>
#include <cstring>
#define DS 1025*1025
int i, caractere, cuvinte, lim;
char cuv[DS];
bool cuvantluat;
int main()
{
	
	freopen("text.in", "r", stdin);
	freopen("text.out", "w", stdout);
	fgets(cuv, DS, stdin);
	lim=strlen(cuv);
	for(i=0; i<lim; i++)
	{
		if((cuv[i]>='a' && cuv[i]<='z') || (cuv[i]>='A' && cuv[i]<='Z'))
		{
			caractere++;
			cuvantluat=true;
		}
		else if(cuvantluat)
			cuvinte++;
	}
	printf("%d", caractere/cuvinte);
}