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

using namespace std;

int main()
{
    FILE *file_in = fopen("text.in", "r");
    FILE *file_out = fopen("text.out", "w");
    char text[1024];
    int l = 0, nr = 0;
    fgets(text, sizeof(text), file_in);
    char *s = strtok(text, " ,.-:!?");
    while (s) {
        l += strlen(s);
        nr++;
        s = strtok(NULL, " ,.-:!?");
    }
    fprintf(file_out, "%d\n", l / nr);
    fclose(file_in);
    fclose(file_out);
}