#include<bits/stdc++.h>
using namespace std;
typedef long long ll;

const ll mod = 1e9 + 7;
ll l, r, suml, sumr;

main() {
	ios_base::sync_with_stdio(0), cin.tie(0);
	cin >> l >> r;
	--l;
	bool f = 1;
	ll c1 = 1, c2 = 2, lef = 1, c = 1;
	while(1) {
		if (l == 0) break;
		if (lef + c - 1 >= l) {
			if (f) {
				suml = (suml + ((c1 + (l - lef) * 2 + c1) * (l - lef + 1) / 2)  % mod) % mod;
			} else {
				suml = (suml + ((c2 + (l - lef) * 2 + c2) * (l - lef + 1) / 2)  % mod) % mod;
			}
			break;
		}
		if (f) {
			suml = (suml + ((c1 + (c - 1) * 2 + c1) * (c) / 2)  % mod) % mod;
		} else {
			suml = (suml + ((c2 + (c - 1) * 2 + c2) * (c) / 2)  % mod) % mod;
		}
		if (f) c1 += 2 * c;
		else c2 += 2 * c;
		lef += c;
		c *= 2;
		f ^= 1;
	}
	c1 = 1, c2 = 2, lef = 1, c = 1;
	l = r;
	f = 1;
	while(1) {
		if (r == 0) break;
		if (lef + c - 1 >= l) {
			//cout << ' ' << lef << ' ' << c << '\n';
			if (f) {
				sumr = (sumr + ((c1 + (l - lef) * 2 + c1) * (l - lef + 1) / 2)  % mod) % mod;
			} else {
				sumr = (sumr + ((c2 + (l - lef) * 2 + c2) * (l - lef + 1) / 2)  % mod) % mod;
			}
			//cout << (c2 + (l - lef) * 2 + c2) * (l - lef + 1) / 2 << '\n';
			break;
		}
		if (f) {
			sumr = (sumr + ((c1 + (c - 1) * 2 + c1) * (c) / 2)  % mod) % mod;
		} else {
			sumr = (sumr + ((c2 + (c - 1) * 2 + c2) * (c) / 2)  % mod) % mod;
		}
		if (f) c1 += 2 * c;
		else c2 += 2 * c;
		lef += c;
		c *= 2;
		f ^= 1;
	}
	//cout << suml << ' ' << sumr << '\n';
	cout << (sumr - suml + mod) % mod << '\n';
	return 0;
}