Little girl Tanya climbs the stairs inside a multi-storey building. Every time Tanya climbs a stairway, she starts counting steps from $1$ to the number of steps in this stairway. She speaks every number aloud. For example, if she climbs two stairways, the first of which contains $3$ steps, and the second contains $4$ steps, she will pronounce the numbers $1, 2, 3, 1, 2, 3, 4$.

You are given all the numbers pronounced by Tanya. How many stairways did she climb? Also, output the number of steps in each stairway.

The given sequence will be a valid sequence that Tanya could have pronounced when climbing one or more stairways.
The first line contains $n$ ($1 \le n \le 1000$) — the total number of numbers pronounced by Tanya.

The second line contains integers $a_1, a_2, \dots, a_n$ ($1 \le a_i \le 1000$) — all the numbers Tanya pronounced while climbing the stairs, in order from the first to the last pronounced number. Passing a stairway with $x$ steps, she will pronounce the numbers $1, 2, \dots, x$ in that order.

The given sequence will be a valid sequence that Tanya could have pronounced when climbing one or more stairways.
7
1 2 3 1 2 3 4
2
3 4 
4
1 1 1 1
4
1 1 1 1 
5
1 2 3 4 5
1
5 
5
1 2 1 2 1
3
2 2 1 
1
1
1
1 
48
1 2 3 4 1 2 3 1 1 2 3 1 2 3 4 1 1 2 3 4 1 2 3 4 1 2 3 4 1 1 2 1 2 1 2 1 1 2 1 2 1 2 3 1 2 1 2 1
20
4 3 1 3 4 1 4 4 4 1 2 2 2 1 2 2 3 2 2 1 
2
1 2
1
2 
3
1 1 2
2
1 2 
4
1 1 2 3
2
1 3 
8
1 2 3 1 2 3 4 5
2
3 5 
5
1 1 1 2 3
3
1 1 3 
n = int(input())
a = [int(x) for x in input().split(" ")]
cnt = 1
stages = []
for i in range(1, n):
    if a[i] == 1:
        cnt += 1
        stages.append(a[i-1])
stages.append(a[-1])
print(cnt)
print(*stages, sep=" ")