N=int(input())
A=list(map(int,input().split()))

def win(A):
    if len(A)<3:
        return 0

    else:
        for i in range(len(A)):
            for j in range(i+1,len(A)):
                for k in range(j+1,len(A)):


                    X=[A[i],A[j],A[k]]

                    if len(set(X))!=3:
                        continue

                    if max(X)==X[1] or min(X)==X[1]:
                        B=[]

                        for l in range(len(A)):
                            if l==i or l==j or l==k:
                                continue
                            B.append(A[l])

                        if win(B)==0:
                            return (i,j,k)

        return 0

k=win(A)

if k==0:
    print(-1)
else:
    print(*k)