Sjatie

n = int(input())
arr = [int(x) for x in input().split()]

result = []
count = 1
elem = arr[0]

if n == 1:
    print(f'{count} {elem}')
else:
    for i in range(1, n):
        if arr[i] == elem:
            count += 1
            if i == n - 1:
                result.append(count)
                result.append(elem)
        else:
            result.append(count)
            result.append(elem)
            elem = arr[i]
            count = 1
            if i == n - 1:
                result.append(count)
                result.append(elem)

    print(' '.join([str(x) for x in result]))