#include <bits/stdc++.h>

#define FastIO ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define endl '\n'
#define ends ' '
#define int long long

const int MOD = 1e9 + 7;

using namespace std;

int T, l, r;

int calc(int x) {
    if (x == 0 || x == 1) return 0;
    if (x == 2) return 1;
    int ret = 0;
    while (x > 1) {
        if (x % 2) x++;
        else x /= 2;
        ret++;
    }
    return ret;
}

int func(int x) {
    if (!x) return 0;
    if (x == 1) return 0;

    int ret = x / 2 - 1;
    ret -= 1;
    ret += ((func(x / 2) % MOD + (x / 2) % MOD) % MOD) * 2;
    if (x % 2) ret += calc(x);

    return ret % MOD;
}

int32_t main(void) {
    FastIO;

    T = 1;
    //cin >> T;

    while (T--) {
        cin >> l >> r;
        int ans = func(r) - func(l - 1);
        if (ans < 0) ans += MOD;
        cout << ans << endl;
    }

    return 0;
}