В одном из тестов выдаёт неизвестную ошибку

def SimpleCountingSort(A):
    c = max(A) + 1
    d = [0] * c
    for x in A:
        d[x] += 1
    A[:] = []
    for n in range(c):
        A += [n] * d[n]
s = []
s = list(map(int, input().split()))
a = []
a = list(map(int, input().split()))
max2 = ''
t = 0
r = [0] * (s[0] + 1)
SimpleCountingSort(a)
for i in range(1, s[0] + 1):
    while t != len(a) and a[t] == i:
        r[i] += 1
        t += 1
max1 = max(r)
for e in range(1, s[0] + 1):
    if r[e] == max1:
        max2 += str(e) + ' '
print(max2)

for e in range(1, s[0] + 1):
    if r[e] == max1:
        print(e, end=" ")

In [1]: from collections import Counter
 
In [2]: n, _ = map(int, input().split())
3 7
 
In [3]: counter = Counter(filter(lambda x: x <= n, map(int, input().split()))).most_common()
1 2 2 1 3 2 3
 
In [4]: last = None
 
In [5]: for i, c in counter:
    ...:     if last is not None and c != last:
    ...:         break
    ...:     print(i, end=" ")
    ...:     last = c
    ...:
2

u, n = [int(i) for i in input().split()]
s=str(input())
ss=set()
x=1
for i in list(s.split(' ')):
  if (x < n):
    if (int(i)<=u): 
      ss.add(i)
  else:
    break
  x+=1
 
out={}
maks=0
for i in ss:
  out[i]=s.count(i)
  if (s.count(i)>maks):
    maks=s.count(i)
 
winners=sorted(out.items(), key=lambda item: item[1], reverse=True)
for i in winners:
  if i[1]==maks: 
    print(i[0])