n, m = map(int, input().split())
rungs = [int(input()) for _ in range(m)]

res = [
    0,
] * n
for element in range(1, n + 1):
    pos = element
    for r in rungs:
        if pos == r:
            pos += 1
        elif pos == r + 1:
            pos -= 1
    res[pos - 1] = element
print("\n".join(map(str, res)))