#include<stdio.h>

#define isLetter(a) (((a) >= 'a' && (a) <= 'z') || ((a) >= 'A' && (a) <= 'Z')) ? 1 : 0
inline int len(char *c) { return (*c ? 1 + len(++c) : 0); }

char c;
int total,litere,cuvant = 0;
int main()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    
	
    while(scanf("%c",&c) != EOF)
    {
		if(isLetter(c))
		{
			if(!cuvant)
			{
			   total++;
			   cuvant = 1;
			}
			litere++;
		}
		else
		{
			cuvant = 0;
		}
	}
      	
    printf("%d\n",total > 0 ? litere/total : 0);
    
    fclose(stdin); fclose(stdout);
    return 0;
}