#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<ctype.h>

int main() {
	FILE *input, *output;
	input = fopen("text.in","r");
	output = fopen("text.out","w");
	char x[20];
	int litere = 0, cuvant = 0;
	while(fscanf(input,"%s", x)!=EOF) {
		if(!isalpha(x[0]))
			continue;
		int i = 0;
		cuvant++;
		while(x[i] != '\0') {
			if(isalpha(x[i]))
				litere++;
			else if(x[i] == '-')
				cuvant++;
			i++;
		}
	}
//	fprintf(output,"%d %d\n", litere, cuvant);
	fprintf(output,"%d", litere/cuvant);
	return 0;
}