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

#define SIZE (1024 * 1024 * 2)
char data[SIZE];

inline int isChar(char c) {
    return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z');
}

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

    fgets(data, SIZE, stdin);

    int n = strlen(data);
    int i, c = 0, len = 0;
    while (i < n) {
        while (!isChar(data[i]) && i < n)
            i++;
        c++;
        while (isChar(data[i]) && i < n) {
            i++;
            len++;
        }
    }

    printf("%d\n", c == 0 ? 0 : len / c);

    return 0;
}