Buggy python submission (verdict: Time Limit Exceeded):
#!/usr/bin/env python3
import sys

def solve(X: int, Y: int, Z: int, K: int, A: "List[int]", B: "List[int]", C: "List[int]"):
    l = [0]*X*Y
    for i in range(X):
        for j in range(Y):
            l[i+j*X] = A[i]+B[j]

    l.sort(reverse=True)
    t = min(3000,X*Y)
    l = l[:t]

    ans = [0] * (t) * Z
    for i in range(t):
        for j in range(Z):
            ans[i+j*t] = l[i] + C[j]

    ans.sort(reverse=True)
    for i in range(K):
        print(ans[i])


    return


# Generated by 1.1.3 https://github.com/kyuridenamida/atcoder-tools  (tips: You use the default template now. You can remove this line by using your custom template)
def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    X = int(next(tokens))  # type: int
    Y = int(next(tokens))  # type: int
    Z = int(next(tokens))  # type: int
    K = int(next(tokens))  # type: int
    A = [ int(next(tokens)) for _ in range(X) ]  # type: "List[int]"
    B = [ int(next(tokens)) for _ in range(Y) ]  # type: "List[int]"
    C = [ int(next(tokens)) for _ in range(Z) ]  # type: "List[int]"
    solve(X, Y, Z, K, A, B, C)

if __name__ == '__main__':
    main()


Fixed submission:
#!/usr/bin/env python3
import sys

def solve(X: int, Y: int, Z: int, K: int, A: "List[int]", B: "List[int]", C: "List[int]"):
    l = [0]*X*Y
    for i in range(X):
        for j in range(Y):
            l[i+j*X] = A[i]+B[j]

    l.sort(reverse=True)
    t = min(3000,X*Y)
    l = l[:t]

    ans = [0] * (t) * Z
    for i in range(t):
        for j in range(Z):
            ans[i+j*t] = l[i] + C[j]

    ans.sort(reverse=True)
    for i in range(K):
        print(ans[i])


    return


# Generated by 1.1.3 https://github.com/kyuridenamida/atcoder-tools  (tips: You use the default template now. You can remove this line by using your custom template)
def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    X = int(next(tokens))  # type: int
    Y = int(next(tokens))  # type: int
    Z = int(next(tokens))  # type: int
    K = int(next(tokens))  # type: int
    A = [ int(next(tokens)) for _ in range(X) ]  # type: "List[int]"
    B = [ int(next(tokens)) for _ in range(Y) ]  # type: "List[int]"
    C = [ int(next(tokens)) for _ in range(Z) ]  # type: "List[int]"
    solve(X, Y, Z, K, A, B, C)

if __name__ == '__main__':
    main()

Buggy python submission (verdict: Time Limit Exceeded):
#!/usr/bin/env python3
import sys

def solve(X: int, Y: int, Z: int, K: int, A: "List[int]", B: "List[int]", C: "List[int]"):
    l = [0]*X*Y
    for i in range(X):
        for j in range(Y):
            l[i+j*X] = A[i]+B[j]

    l.sort()
    t = min(3000, K)
    l = l[-t:]

    ans = [0] * len(l)*Z
    ls = len(l)
    for i in range(ls):
        for j in range(Z):
            ans[i+j*ls] = l[i] + C[j]

    ans.sort(reverse=True)
    for i in range(K):
        print(ans[i])


    return


# Generated by 1.1.3 https://github.com/kyuridenamida/atcoder-tools  (tips: You use the default template now. You can remove this line by using your custom template)
def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    X = int(next(tokens))  # type: int
    Y = int(next(tokens))  # type: int
    Z = int(next(tokens))  # type: int
    K = int(next(tokens))  # type: int
    A = [ int(next(tokens)) for _ in range(X) ]  # type: "List[int]"
    B = [ int(next(tokens)) for _ in range(Y) ]  # type: "List[int]"
    C = [ int(next(tokens)) for _ in range(Z) ]  # type: "List[int]"
    solve(X, Y, Z, K, A, B, C)

if __name__ == '__main__':
    main()


Fixed submission:
#!/usr/bin/env python3
import sys

def solve(X: int, Y: int, Z: int, K: int, A: "List[int]", B: "List[int]", C: "List[int]"):
    l = [0]*X*Y
    for i in range(X):
        for j in range(Y):
            l[i+j*X] = A[i]+B[j]

    l.sort(reverse=True)
    t = min(3000,X*Y)
    l = l[:t]

    ans = [0] * (t) * Z
    for i in range(t):
        for j in range(Z):
            ans[i+j*t] = l[i] + C[j]

    ans.sort(reverse=True)
    for i in range(K):
        print(ans[i])


    return


# Generated by 1.1.3 https://github.com/kyuridenamida/atcoder-tools  (tips: You use the default template now. You can remove this line by using your custom template)
def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    X = int(next(tokens))  # type: int
    Y = int(next(tokens))  # type: int
    Z = int(next(tokens))  # type: int
    K = int(next(tokens))  # type: int
    A = [ int(next(tokens)) for _ in range(X) ]  # type: "List[int]"
    B = [ int(next(tokens)) for _ in range(Y) ]  # type: "List[int]"
    C = [ int(next(tokens)) for _ in range(Z) ]  # type: "List[int]"
    solve(X, Y, Z, K, A, B, C)

if __name__ == '__main__':
    main()

Buggy python submission (verdict: Time Limit Exceeded):
#!/usr/bin/env python3
import sys

def solve(X: int, Y: int, Z: int, K: int, A: "List[int]", B: "List[int]", C: "List[int]"):
    l = [0]*X*Y
    for i in range(X):
        for j in range(Y):
            l[i+j*X] = A[i]+B[j]

    l.sort()
    t = max(3000, K)
    l = l[-t:]

    ans = [0] * len(l)*Z
    ls = len(l)
    for i in range(ls):
        for j in range(Z):
            ans[i+j*ls] = l[i] + C[j]

    ans.sort(reverse=True)
    for i in range(K):
        print(ans[i])


    return


# Generated by 1.1.3 https://github.com/kyuridenamida/atcoder-tools  (tips: You use the default template now. You can remove this line by using your custom template)
def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    X = int(next(tokens))  # type: int
    Y = int(next(tokens))  # type: int
    Z = int(next(tokens))  # type: int
    K = int(next(tokens))  # type: int
    A = [ int(next(tokens)) for _ in range(X) ]  # type: "List[int]"
    B = [ int(next(tokens)) for _ in range(Y) ]  # type: "List[int]"
    C = [ int(next(tokens)) for _ in range(Z) ]  # type: "List[int]"
    solve(X, Y, Z, K, A, B, C)

if __name__ == '__main__':
    main()


Fixed submission:
#!/usr/bin/env python3
import sys

def solve(X: int, Y: int, Z: int, K: int, A: "List[int]", B: "List[int]", C: "List[int]"):
    l = [0]*X*Y
    for i in range(X):
        for j in range(Y):
            l[i+j*X] = A[i]+B[j]

    l.sort(reverse=True)
    t = min(3000,X*Y)
    l = l[:t]

    ans = [0] * (t) * Z
    for i in range(t):
        for j in range(Z):
            ans[i+j*t] = l[i] + C[j]

    ans.sort(reverse=True)
    for i in range(K):
        print(ans[i])


    return


# Generated by 1.1.3 https://github.com/kyuridenamida/atcoder-tools  (tips: You use the default template now. You can remove this line by using your custom template)
def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    X = int(next(tokens))  # type: int
    Y = int(next(tokens))  # type: int
    Z = int(next(tokens))  # type: int
    K = int(next(tokens))  # type: int
    A = [ int(next(tokens)) for _ in range(X) ]  # type: "List[int]"
    B = [ int(next(tokens)) for _ in range(Y) ]  # type: "List[int]"
    C = [ int(next(tokens)) for _ in range(Z) ]  # type: "List[int]"
    solve(X, Y, Z, K, A, B, C)

if __name__ == '__main__':
    main()