% https://open.kattis.com/problems/tripodometer
% 1s
% 2.0 Easy

import util.
main :-
    Ns = read_file_lines().tail.first.split.map(to_int),
    Sum = Ns.sum,
    M = new_map(),
    foreach(N in Ns)
      M.put(Sum-N,1),
    end,
    S = M.keys.sort,
    println(s=S),
    println(S.len),
    foreach(V in S) printf("%d ",V) end,
    nl.