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

int main() {
    int i, j,k, cnt = 0;
    char* word;
    char buf1[100], buf2[100], s[10000];
    scanf("%s", s);

    for (i = 0; i < strlen(s) - 1; i++) {
        buf1[i] = s[i];
        for (j = i+1, k = 0; s[j] != '\0'; j++,k++) {
            buf2[k] = s[j];
        }
        buf2[k] = '\0';
        if (buf1[0] != '0' && buf2[0] != '0')cnt++;
    }

    printf("%d\n", cnt);
    return 0;
}