688 B | 688 chars
import sys
from math import sqrt, pi, sin, factorial, ceil, floor
from datetime import datetime, timedelta
BLANK = " "
# inp = input
inp = lambda : sys.stdin.readline()[:-1].strip()
mii = lambda x = BLANK : [*map(int,inp().split(x))]
mfi = lambda x = BLANK : [*map(float,inp().split(x))]
ii = lambda : int(inp())
fi = lambda : float(inp())
p = print
def solve():
N, Y = mii()
l = sorted([*set([ii() for _ in range(Y)])]) + [-1]
i = 0
j = 0
while i < N:
if i == l[j]:
j += 1
else:
p(i)
i += 1
p(f"Mario got {j} of the dangerous obstacles.")
if __name__ == "__main__":
tc = 1
for t in range(1, tc+1):
ret = solve()