#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>

#define int ptrdiff_t
#define div lldiv
#define div_t lldiv_t
#define abs(a) ((a)<0?-(a):(a))
#define min(a,b) ((a)<(b)?(a):(b))

int D;
int a[100000];
int b[4] = {0, -1, 0, 1};

main(void) {
    int i,j;
    scanf("%td", &D);
    for (i = 0; i <= D; i++) 
        scanf("%td", &a[i]);
    for (i = D; i >= 3; i--) {
        int t = a[i] / b[3];
        for (j = 3; j >= 0; j--)
            a[i-3+j] -= t * b[j];
    }
    for (i = 2; i >= 1; i--)
        if (a[i] != 0)
            break;
    printf("%td\n", i);
    for (j = 0; j <= i; j++)
        printf("%td ", a[j]);
    printf("\n");
    return 0;
}