Ileana D'Cruz is taking programming classes but she is having problem in understanding while loops. She is working on following set of instructions -

INTEGER I = 0, S, U = 10¹⁰;

WHILE (I < U) {
S = (3 * S) + (5 * I);
I = I + 1;
}

Let S_k be the value assigned to INTEGER S for the iteration I = (k + 1) and n, m, p be positive integers such that m > n. Ileana knows the values of n and m but she forgot the initial value of S. She is trying to find the unit digit of p. Any initial value of S may be used. She also knows the following equality -

(2 * n + 3) * (p - 1) + (4 / 5) * [(p * S_n) - S_m] = 2 * (m - n)

Input

First line of input is T(total no. of test cases). Each of next T lines contains two integers n and m.

Output

Print unit digit of p (p % 10) for each test case in separated lines.

Example

Input:
1
2 3

Output:
3

Constraints

T < 10001

Explanation

Let S = 2
S₀ = 6
S₁ = 23
S₂ = 79
S₃ = 252
Now solving the equation gives p = 3.