#include <stdio.h>

int main(){
	freopen("text.in", "r", stdin);
	freopen("text.out", "w", stdout);
	char c, cuvant=0;
	int len = 0, nrCuv = 0;
	while(scanf("%c", &c)!=EOF){
		if((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')){
			++len;
			if(cuvant == 0) {
				++nrCuv;
				cuvant = 1;
			}
		}
		else  {
			cuvant = 0;
		}
	}

	int med = len/nrCuv;
	printf("%d", med);


	return 0;
}