gets
$t=gets.to_i
a=gets.split.map(&:to_i)
def dfs a,n
  if a[0]
    if dfs(a[1..-1],n+a[0])
      print ?+
      true
    elsif dfs(a[1..-1],n*a[0])
      print ?*
      true
    end
  else
    n==$t
  end
end
dfs a[1..-1],a[0]
puts