"""
출처:프로그래머스,
https://school.programmers.co.kr/learn/courses/30/lessons/181858
"""

# 풀이 과정
def solution(arr, k):
    result = []
    for x in arr:
        if x not in result and len(result) < k:
            result.append(x)
        else:
            continue

    if len(result) < k:
        g = k - len(result)
        for l in range(g):
            result.append(-1)

    return result