#include <iostream>

int main() {
    int a;
    int count = 0;
    scanf("%d", &a);
    int *mas = new int [a];
    for (int i = 0; i < a; i++) {
        scanf("%d", &mas[i]);
    }
    for (int i = 0; i < a; i++) {
        if (mas[i] == 1) {
            count = count + 1;
        }
    }
    printf("\n%d\n", count);
    int *masq = new int [count];
    int j = 0;
    for (int i = 0; i < a; i++) {
        masq[j] = masq[j] + 1;
        if (mas[i+1] == 1) {
            j = j + 1;
        }
    }
    for (int j = 0; j < count; j++) {
        printf("%d ", masq[j]);
    }
}