#include <bits/stdc++.h>

using namespace std;
using ll = long long;
// #define int ll
using PII = pair<ll, ll>;

#define FOR(i, a, n) for (ll i = (ll)a; i < (ll)n; ++i)
#define REP(i, n) FOR(i, 0, n)
#define ALL(x) x.begin(), x.end()

template<typename T> T &chmin(T &a, const T &b) { return a = min(a, b); }
template<typename T> T &chmax(T &a, const T &b) { return a = max(a, b); }
template<typename T> bool IN(T a, T b, T x) { return a<=x&&x<b; }
template<typename T> T ceil(T a, T b) { return a/b + !!(a%b); }

template<typename T> vector<T> make_v(size_t a) { return vector<T>(a); }
template<typename T,typename... Ts>
auto make_v(size_t a,Ts... ts) {
    return vector<decltype(make_v<T>(ts...))>(a,make_v<T>(ts...));
}
template<typename T,typename V> typename enable_if<is_class<T>::value==0>::type
fill_v(T &t, const V &v) { t=v; }
template<typename T,typename V> typename enable_if<is_class<T>::value!=0>::type
fill_v(T &t, const V &v ) { for(auto &e:t) fill_v(e,v); }

template<class S,class T>
ostream &operator <<(ostream& out,const pair<S,T>& a){
    out<<'('<<a.first<<','<<a.second<<')'; return out;
}
template<class T>
ostream &operator <<(ostream& out,const vector<T>& a){
    out<<'['; for(T i: a) {out<<i<<',';} out<<']'; return out;
}

int dx[] = {0, 1, 0, -1}, dy[] = {1, 0, -1, 0}; // DRUL
const int INF = 1<<30;
const ll LLINF = 1LL<<60;
const ll MOD = 1000000007;

template<ll MOD>
struct modint {
    ll x;
    modint(): x(0) {}
    modint(ll y) : x(y>=0 ? y%MOD : y%MOD+MOD) {}
    static constexpr ll mod() { return MOD; }
    // e乗
    modint pow(ll e) {
        ll a = 1, p = x;
        while(e > 0) {
            if(e%2 == 0) {p = (p*p) % MOD; e /= 2;}
            else {a = (a*p) % MOD; e--;}
        }
        return modint(a);
    }
    modint inv() const {
        ll a=x, b=MOD, u=1, y=1, v=0, z=0;
        while(a) {
            ll q = b/a;
            swap(z -= q*u, u);
            swap(y -= q*v, v);
            swap(b -= q*a, a);
        }
        return z;
    }
    // Comparators
    bool operator <(modint b) { return x < b.x; }
    bool operator >(modint b) { return x > b.x; }
    bool operator<=(modint b) { return x <= b.x; }
    bool operator>=(modint b) { return x >= b.x; }
    bool operator!=(modint b) { return x != b.x; }
    bool operator==(modint b) { return x == b.x; }
    // Basic Operations
    modint operator+(modint r) const { return modint(*this) += r; }
    modint operator-(modint r) const { return modint(*this) -= r; }
    modint operator*(modint r) const { return modint(*this) *= r; }
    modint operator/(modint r) const { return modint(*this) /= r; }
    modint &operator+=(modint r) {
        if((x += r.x) >= MOD) x -= MOD;
        return *this;
    }
    modint &operator-=(modint r) {
        if((x -= r.x) <= 0) x += MOD;
        return *this;
    }
    modint &operator*=(modint r) { x = x * r.x % MOD; return *this; }
    modint &operator/=(modint r) { return *this *= r.inv(); }
    // increment, decrement
    modint operator++() { x++; return *this; }
    modint operator++(signed) { modint t = *this; x++; return t; }
    modint operator--() { x--; return *this; }
    modint operator--(signed) { modint t = *this; x--; return t; }
};
using mint = modint<1000000007>;
template<class T> mint operator*(T l, mint r) { return mint(l) *= r; }
template<class T> mint operator+(T l, mint r) { return mint(l) += r; }
template<class T> mint operator-(T l, mint r) { return mint(l) -= r; }
template<class T> mint operator/(T l, mint r) { return mint(l) /= r; }
template<class T> bool operator==(T l, mint r) { return mint(l) == r; }
template<class T> bool operator!=(T l, mint r) { return mint(l) != r; }
// Input/Output
ostream &operator<<(ostream& os, mint a) { return os << a.x; }
istream &operator>>(istream& is, mint &a) { return is >> a.x; }
string to_frac(mint v) {
    static map<ll, PII> mp;
    if(mp.empty()) {
        mp[0] = mp[mint::mod()] = {0, 1};
        FOR(i, 2, 1001) FOR(j, 1, i) if(__gcd(i, j) == 1) {
            mp[(mint(i) / j).x] = {i, j};
        }
    }
    auto itr = mp.lower_bound(v.x);
    if(itr != mp.begin() && v.x - prev(itr)->first < itr->first - v.x) --itr;
    string ret = to_string(itr->second.first + itr->second.second * ((int)v.x - itr->first));
    if(itr->second.second > 1) {
        ret += '/';
        ret += to_string(itr->second.second);
    }
    return ret;
}

template<bool bigN=false>
mint combi(ll N, ll K) {
    const int maxN=5e5; // !!!
    static mint fact[maxN+1]={},factr[maxN+1]={},inv[maxN+1]={};
    if (fact[0]==0) {
        fact[0] = factr[0] = inv[0] = 1;
        FOR(i, 1, maxN+1) fact[i] = fact[i-1] * i;
        factr[maxN] = fact[maxN].inv();
        for(ll i=maxN-1; i>=0; --i) factr[i] = factr[i+1] * (i+1);
        if(bigN) REP(i, maxN+1) inv[i] = mint(i).inv();
    }
    if(K<0 || K>N) return 0; // !!!
    // 前計算 O(max(N,K)) クエリ O(1)
    if(!bigN) return factr[K]*fact[N]*factr[N-K];
    // Nが大きいけどKが小さい場合に使う 前計算 O(Klog(mod)) クエリ O(K)
    mint ret = 1;
    for(;K>0;N--,K--) ret *= N, ret *= inv[K];
    return ret;
}

signed main(void)
{
    cin.tie(0);
    ios::sync_with_stdio(false);

    ll b, w;
    cin >> b >> w;

    mint prob1_a = 0, prob2_a = 0;
    REP(i, b+w) {
        // 白しかない
        mint prob1;
        if(i < b) prob1 = 0;
        else prob1 = (mint(1) / 2).pow(i) * combi(i-1, b-1);
        prob1_a += prob1;
        // 黒しかない
        mint prob2;
        if(i < w) prob2 = 0;
        else prob2 = (mint(1) / 2).pow(i) * combi(i-1, w-1);
        prob2_a += prob2;
        // 両方ある
        mint prob3 = 1 - prob1_a - prob2_a;
        mint ret = prob2_a + prob3 / 2;
        // cerr << to_frac(ret) << endl;
        // cout << prob1_a << " " << prob2_a << " " << prob3 << endl;
        cout << ret << endl;
    }

    return 0;
}


Measured memory_bytes: 13952