Buggy python submission (verdict: Time Limit Exceeded):
import itertools
import sys

input = sys.stdin.readline

maxn = 10000000000

X, Y, Z, K = map(int, input().split())
A = list(map(int, input().split()))
B = list(map(int, input().split()))
C = list(map(int, input().split()))

A.append(-maxn)
B.append(-maxn)
C.append(-maxn)

A.sort(reverse=True)
B.sort(reverse=True)
C.sort(reverse=True)

apos, bpos, cpos = 0, 0, 0

while (apos + 1) * (bpos + 1) * (cpos + 1) < min(2 * 10 ** 6, X * Y * Z):
    if (
        apos < len(A) - 2
        and abs(A[apos] - A[apos + 1]) < abs(B[bpos] - B[bpos + 1])
        and abs(A[apos] - A[apos + 1]) < abs(C[cpos] - C[cpos + 1])
    ):
        apos += 1
    elif bpos < len(B) - 2 and B[bpos] - B[bpos + 1] < C[cpos] - C[cpos + 1]:
        bpos += 1
    else:
        cpos += 1

res = []
for a in list(itertools.product(A[: apos + 1], B[: bpos + 1], C[: cpos + 1])):
    res.append(a[0] + a[1] + a[2])

res.sort(reverse=True)
for k in range(K):
    print(res[k])


Fixed submission:
import itertools
import sys

input = sys.stdin.readline

maxn = 10000000000

X, Y, Z, K = map(int, input().split())
A = sorted(list(map(int, input().split())), reverse=True)
B = sorted(list(map(int, input().split())), reverse=True)
C = sorted(list(map(int, input().split())), reverse=True)

cand = []
for i, a in enumerate(A):
    for j, b in enumerate(B):
        for k, c in enumerate(C):
            if (i + 1) * (j + 1) * (k + 1) <= K:
                cand.append(a + b + c)
            else:
                break

cand.sort(reverse=True)
for k in range(K):
    print(cand[k])

Buggy python submission (verdict: Time Limit Exceeded):
import itertools
import sys

input = sys.stdin.readline

maxn = 10000000000

X, Y, Z, K = map(int, input().split())
A = list(map(int, input().split()))
B = list(map(int, input().split()))
C = list(map(int, input().split()))

A.append(-maxn)
B.append(-maxn)
C.append(-maxn)

A.sort(reverse=True)
B.sort(reverse=True)
C.sort(reverse=True)

apos, bpos, cpos = 0, 0, 0

while (apos + 1) * (bpos + 1) * (cpos + 1) < min(10 ** 7 - 5 * 10 ** 6, X * Y * Z):
    if (
        apos < len(A) - 2
        and abs(A[apos] - A[apos + 1]) < abs(B[bpos] - B[bpos + 1])
        and abs(A[apos] - A[apos + 1]) < abs(C[cpos] - C[cpos + 1])
    ):
        apos += 1
    elif bpos < len(B) - 2 and B[bpos] - B[bpos + 1] < C[cpos] - C[cpos + 1]:
        bpos += 1
    else:
        cpos += 1

res = []
for a in list(itertools.product(A[: apos + 1], B[: bpos + 1], C[: cpos + 1])):
    res.append(a[0] + a[1] + a[2])

res.sort(reverse=True)
for k in range(K):
    print(res[k])


Fixed submission:
import itertools
import sys

input = sys.stdin.readline

maxn = 10000000000

X, Y, Z, K = map(int, input().split())
A = sorted(list(map(int, input().split())), reverse=True)
B = sorted(list(map(int, input().split())), reverse=True)
C = sorted(list(map(int, input().split())), reverse=True)

cand = []
for i, a in enumerate(A):
    for j, b in enumerate(B):
        for k, c in enumerate(C):
            if (i + 1) * (j + 1) * (k + 1) <= K:
                cand.append(a + b + c)
            else:
                break

cand.sort(reverse=True)
for k in range(K):
    print(cand[k])

Buggy python submission (verdict: Time Limit Exceeded):
import itertools
import sys

input = sys.stdin.readline

maxn = 10000000000

X, Y, Z, K = map(int, input().split())
A = list(map(int, input().split()))
B = list(map(int, input().split()))
C = list(map(int, input().split()))

A.append(-maxn)
B.append(-maxn)
C.append(-maxn)

A.sort(reverse=True)
B.sort(reverse=True)
C.sort(reverse=True)

apos, bpos, cpos = 0, 0, 0

while (apos + 1) * (bpos + 1) * (cpos + 1) < min(10 ** 7, X * Y * Z):
    if (
        apos < len(A) - 2
        and abs(A[apos] - A[apos + 1]) < abs(B[bpos] - B[bpos + 1])
        and abs(A[apos] - A[apos + 1]) < abs(C[cpos] - C[cpos + 1])
    ):
        apos += 1
    elif bpos < len(B) - 2 and B[bpos] - B[bpos + 1] < C[cpos] - C[cpos + 1]:
        bpos += 1
    else:
        cpos += 1

res = []
for a in list(itertools.product(A[: apos + 1], B[: bpos + 1], C[: cpos + 1])):
    res.append(a[0] + a[1] + a[2])

res.sort(reverse=True)
for k in range(K):
    print(res[k])


Fixed submission:
import itertools
import sys

input = sys.stdin.readline

maxn = 10000000000

X, Y, Z, K = map(int, input().split())
A = sorted(list(map(int, input().split())), reverse=True)
B = sorted(list(map(int, input().split())), reverse=True)
C = sorted(list(map(int, input().split())), reverse=True)

cand = []
for i, a in enumerate(A):
    for j, b in enumerate(B):
        for k, c in enumerate(C):
            if (i + 1) * (j + 1) * (k + 1) <= K:
                cand.append(a + b + c)
            else:
                break

cand.sort(reverse=True)
for k in range(K):
    print(cand[k])