def isKadomatsu(a,b,c):
  if b<a<c or c<a<b:return True
  if a<c<b or b<c<a:return True
  return False
def dfs(N,K,used):
  ret=False
  for ii in range(N):
    if used[ii]:continue
    for jj in range(ii+1,N):
      if used[jj]:continue
      for kk in range(jj+1,N):
        if used[kk]:continue
        if not isKadomatsu(K[ii],K[jj],K[kk]):continue
        used[ii]=used[jj]=used[kk]=True
        ret=ret or not dfs(N,K,used)
        used[ii]=used[jj]=used[kk]=False
  return ret
def main():
  N=input()
  K=map(int,raw_input().split(" "))
  used=[False for i in range(N)]
  for i in range(N):
    for j in range(i+1,N):
      for k in range(j+1,N):
        if not isKadomatsu(K[i],K[j],K[k]):continue
        used[i]=used[j]=used[k]=True
        if not dfs(N,K,used):
          print i,j,k
          return
        used[i]=used[j]=used[k]=False
  print -1
main()