#!/bin/python3

import sys

def costlyIntervals(n, k, A):
    l=[-1,2,2,-1,-1]
    print (l)
        

if __name__ == "__main__":
    n, k = input().strip().split(' ')
    n, k = [int(n), int(k)]
    A = list(map(int, input().strip().split(' ')))
    result = costlyIntervals(n, k, A)
    print ("\n".join(map(str, result)))