#include <cstdio>
#include <ctime>
#include <cstdlib>
#include <cstring>

using namespace std;
char s[550];

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

    fgets(s,550,stdin);
    N=strlen(s);

    srand(time(NULL));
	int x=0;
	while(x%2==0) x=rand()%N;

    printf("%d\n",x);

    return 0;
}