from __future__ import print_function
import sys
n   = int(sys.stdin.readline())
ss  = map(int, sys.stdin.readline().split())
tt  = sorted(enumerate(ss), key = lambda (i,x): -x)
print(" ".join(str(x[0]+1) for x in tt) if tt[0][1] <= sum(ss)-tt[0][1]
      else "impossible")