#include <iostream>
#include <cstdio>
#include <cstring>
#define MAXN 1000050

using namespace std;

char s[MAXN];
char sep[200];

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

	gets(s);
	for (int i = 1; i < 128; i++)
		if (!(i >= 'a' && i <= 'z') && !(i >= 'A' && i <= 'Z'))
			sep[strlen(sep)] = i;
	int cuv, len;
	cuv = len = 0;
    for (char *p = strtok(s, sep); p; p = strtok(NULL, sep)) {
		cuv++;
        len += strlen(p);
    }
    printf("%d", len / cuv);


    return 0;
}