Given two integers, L and U. Find the sum of integers bounded by L and U, (both inclusive). Modulo the sum with (10^9 + 7).
Example,
if L = 1, U = 2, output = 3. because 1+2 =3.
if L = 3, U = 5, output = 12, because 3+4+5 = 12.
both L and U will be positive.
Solve

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Pauli Huusari Riccardo G. Tomoaki Takagi 子俊

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