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

#define NMAX 50000000


int main()
{
long cuv = 0, ok = 0, carac = 0;
char s;



freopen("text.in", "r", stdin);
freopen("text.out", "w", stdout);



while(!feof(stdin))
	{
		scanf("%c", &s);


		if(  !ok  && isalpha(s) )
			{
				++cuv;
				ok = 1;
				++carac;
			}
		else if(  ok  &&  isalpha(s)  )
			{
				++carac;
			}
		else if(  ok &&  !isalpha(s)  )
			{
				ok = 0;
			}
	}

printf("%ld\n", (carac/cuv));


fclose(stdin);
fclose(stdout);


return 0;
}