#include <bits/stdc++.h>

using namespace std;

int ind[4 * 100010];
int x[4 * 100010];

int main() {
    int n;
    scanf("%d", &n);
    for (int i = 1; i <= n; ++i)
        scanf("%d", &x[i]);
    for (int i = 0; i < n; ++i)
        ind[i] = -1;
    ind[0] = 0;
    int psum = 0;
    for (int i = 1; i <= n; ++i) {
        psum = (psum + x[i]) % n;
        if (ind[psum] != -1) {
            printf("%d\n", i - (ind[psum] + 1) + 1);
            for (int j = ind[psum] + 1; j <= i; ++j)
                printf("%d ", j);
            return 0;
        } else
            ind[psum] = i;
    }
    return 0;
}