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#include "stdio.h"

int main(void) {
    int n;
    scanf("%d", &n);
    int a, ones = 0;
    for (int i = 0; i < n; i++) {
        scanf("%d", &a);
        if (a == 1) ones++;
    }
    if (ones > 1) printf("0\n2\n1 2");
    else if (ones == 1) printf("1\n2\n1 2");
    else printf("2\n2\n1 2");
    return 0;
}