remove_last(A, C) :-
    reverse(A, [_|B]),
    reverse(B, C).

strings_chars([], []).
strings_chars([A|As], [B|Bs]) :-
    string_chars(A, B),
    strings_chars(As, Bs).

read_file(Stream, []) :-
    at_end_of_stream(Stream).
read_file(Stream, [X|Xs]) :-
    \+ at_end_of_stream(Stream),
    read_line_to_codes(Stream, C),
    string_chars(S, C),
    split_string(S, "|", "", [A, B]),
    split_string(A, " ", "", A0),
    split_string(B, " ", "", [_|B0]),
    remove_last(A0, A1),
    strings_chars(A1, A2),
    strings_chars(B0, B1),
    X = [A2, B1],
    % X = S,
    read_file(Stream, Xs).

main :-
    open('../input/08', read, Stream),
    read_file(Stream, Lines), !,
    close(Stream),
    solve_all(Lines, Ans),
    print(Ans).

solve_all([], 0).
solve_all([L|Ls], S) :-
    solve(L, A),
    solve_all(Ls, S0),
    S is S0 + A.

dig_dec(A, N) :-
    dig_dec(A, 0, N).
dig_dec([], N, N).
dig_dec([A|As], N, C) :-
    C0 is N * 10 + A,
    dig_dec(As, C0, C).

letter(a).
letter(b).
letter(c).
letter(d).
letter(e).
letter(f).
letter(g).

solve([Q, W], X) :-
    letter(A), letter(B), letter(C), letter(D), letter(E), letter(F), letter(G),
    A \= B, A \= C, A \= D, A \= E, A \= F, A \= G,
    B \= C, B \= D, B \= E, B \= F, B \= G,
    C \= D, C \= E, C \= F, C \= G,
    D \= E, D \= F, D \= G,
    E \= F, E \= G,
    F \= G,
    length(A1, 2), length(A7, 3), length(A4, 4), length(A2, 5), length(A3, 5), length(A5, 5), length(A0, 6), length(A6, 6), length(A9, 6), length(A8, 7),
    permutation([A0, A1, A2, A3, A4, A5, A6, A7, A8, A9], Q),
    permutation([C, F], A1),
    permutation([A, C, F], A7),
    permutation([B, C, D, F], A4),
    permutation([A, B, C, D, E, F, G], A8),
    permutation([A, B, D, F, G], A5),
    permutation([A, C, D, F, G], A3),
    permutation([A, C, D, E, G], A2),
    permutation([A, B, C, E, F, G], A0),
    permutation([A, B, D, E, F, G], A6),
    permutation([A, B, C, D, F, G], A9), !,
    decode_all(W, Y, [A0, A1, A2, A3, A4, A5, A6, A7, A8, A9]),
    dig_dec(Y, X).

decode_all([], [], _).
decode_all([Q|Qs], [W|Ws], A) :-
    decode(Q, W, A),
    decode_all(Qs, Ws, A).

decode(Q, W, [A0, A1, A2, A3, A4, A5, A6, A7, A8, A9]) :-
    ((permutation(A0, Q), W is 0);
    (permutation(A1, Q), W is 1);
    (permutation(A2, Q), W is 2);
    (permutation(A3, Q), W is 3);
    (permutation(A4, Q), W is 4);
    (permutation(A5, Q), W is 5);
    (permutation(A6, Q), W is 6);
    (permutation(A7, Q), W is 7);
    (permutation(A8, Q), W is 8);
    (permutation(A9, Q), W is 9)), !.