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

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

    char text[1000005];
    char *p;
    int nrcuv = 0;
    int nrcaractere = 0;

    gets(text);

    p = strtok(text, " .,?!-_/][{}=+*");
    while (p){

        nrcuv++;
        nrcaractere += strlen(p);

        p = strtok(NULL, " .,?!-_/][{}=+*");
    }

    printf("%d", nrcaractere / nrcuv);

    return 0;
}