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#include <cstdint>
#include <cstdio>

using namespace std;

const int8_t req = 2;

int main() {
    int32_t i, n, a;
    int8_t ones, edits;

    scanf("%d\n", &n);

    ones = 0;
    for (i = 0; i < n && ones != req; ++i) {
        scanf("%d", &a);
        if (a == 1) {
            ++ones;
        }
    }
    edits = req - ones;

    printf("%d\n%d\n1 2", edits, req);
    return 0;
}