#include <bits/stdc++.h>
//#include <boost/multiprecision/cpp_int.hpp>
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}, {0, 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) {
    if (A == 0) return 0;
    if (A == 1) return 1;
    if (A == 2) {
        ll D[] = {4, 2};
        return D[B % 2];
    }
    if (A == 3) return 3;
    if (A == 4) return 4;

    ll D[] = {1, 5};
    return D[B % 2];
}
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)) + 5) % 6] << endl;
}

// for compilation: g++ -Ofast -march=native -o _ _.cpp -std=c++17