func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long a, b, i, ans, p, MD = 1000000007;     cin >> a >> b;     p = ((a * (a + 1)) / 2) % MD;     p = p * b % MD;     p = (a + p) % MD;     ans = ((b * (b - 1) / 2)) % MD;     ans = (ans * p) % MD;     cout << ans << endl;     return 0;   }   