#!/usr/bin/env python
#coding:utf8

def read():
    raw_input()
    return map(int, raw_input().split())


def isKadomatsu(A, B, C):
    return B > A > C or B > C > A or A > C > B or C > A > B


def rec(vList, used):
    
    for i in range(len(vList)):
        if used[i]:
            continue
        
        for j in range(i + 1, len(vList)):
            if used[j]:
                continue
            
            for k in range(j + 1, len(vList)):
                if used[k]:
                    continue
                
                if not isKadomatsu(vList[i], vList[j], vList[k]):
                    continue
                
                used[i] = used[j] = used[k] = True
                
                opp = rec(vList, used)
                
                used[i] = used[j] = used[k] = False
                
                if opp == [-1]:
                    return [i, j, k]
                
    return [-1]


def work(vList):
    print " ".join(map(str, rec(vList, [False for v in vList])))


if __name__ == "__main__":
    work(read())