#include <bits/stdc++.h>

int ra, rb, rc;
int N;
int K[16];

bool ispinedec(int a, int b, int c) {
  if( a < b and b > c ) return true;
  if( a > b and b < c ) return true;
  return false;
}

bool solve() {
  for(int i = 0; i < N; ++i) {
    for(int j = i + 1; j < N; ++j) {
      for(int k = j + 1; k < N; ++k) {
        int x = K[i], y = K[j], z = K[k];
        if( x == -1 or y == -1 or z == -1 ) continue;
        if( not ispinedec(x, y, z) ) continue;
        K[i] = K[j] = K[k] = -1;
        auto res = solve();
        K[i] = x; K[j] = y; K[k] = z;
        if( not res ) {
          ra = i, rb = j, rc = k;
          return true;
        }
      }
    }
  }
  return false;
}

int main() {

  std::cin >> N;
  for(int i = 0; i < N; ++i) std::cin >> K[i];

  if( solve() ) {
    std::cout << ra << ' ' << rb << ' ' << rc << std::endl;
  }
  else {
    std::cout << -1 << std::endl;
  }

  return 0;
}