#include //#include using namespace std; // using namespace boost::multiprecision; // Define using ll = long long; using ull = unsigned long long; using ld = long double; using int128 = __int128; // using cint = cpp_int; const ll MOD = 1e9 + 7; const ll INF = LONG_MAX; const ull MAX = ULONG_MAX; #define endl '\n' #define space ' ' #define def inline auto #define func inline constexpr ll #define run __attribute__((constructor)) def _ #define all(v) begin(v), end(v) // Debug #define debug(...) \ { \ cerr << __LINE__ << ": " << #__VA_ARGS__ << " = "; \ for (auto &&X : {__VA_ARGS__}) cerr << "[" << X << "] "; \ cerr << endl; \ } // Loop #define inc(i, a, n) for (ll i = (a), _##i = (n); i <= _##i; ++i) #define dec(i, a, n) for (ll i = (a), _##i = (n); i >= _##i; --i) #define each(i, a) for (auto &&i : a) #define rep(i, n) inc(i, 0, n - 1) // Stream #define input(a) scanf("%lld", &(a)) #define output(a) printf("%lld\n", (a)) #define fout(n) cout << fixed << setprecision(n) #define fasten cin.tie(0), ios::sync_with_stdio(0) // Speed run() { fasten, fout(10); } #pragma GCC optimize("O3") #pragma GCC optimization_level 3 #pragma GCC target("avx") // Math func gcd(ll a, ll b) { return b ? gcd(b, a % b) : a; } func lcm(ll a, ll b) { return a * b / gcd(a, b); } ll V[2][3] = {{3, 1, 5}, {6, 4, 2}}; ll ctoi(char A) { return A - '0'; } ll smod6(string A) { ll S = 0, D = ctoi(A.back()) % 2; for (auto i : A) { S += ctoi(i); } S %= 3; return V[!D][S]; } ll P(ll A, ll B) { ll S; if (A == 0) { S = 0; } else if (A == 1) { S = 1; } else if (A == 2) { ll D[] = {4, 2}; S = D[B % 2]; } else if (A == 3) { S = 3; } else if (A == 4) { S = 4; } else { ll D[] = {1, 5}; S = D[B % 2]; } return S; } ll A[] = {2, 8, 5, 7, 1, 4}, C; signed main() { string S, T; cin >> S >> T; debug(smod6(S), smod6(T), P(smod6(S), smod6(T))); cout << A[(P(smod6(S), smod6(T)) - 1) % 6] << endl; } // for compilation: g++ -Ofast -march=native -o _ _.cpp -std=c++17