Midpoint of a Segment

Version: Phuoc Hung OJ Extended

Problem Statement

Given segment endpoints $A(x_1,y_1)$ and $B(x_2,y_2)$, their midpoint $M$ has coordinates $x_M=\dfrac{x_1+x_2}{2}$ and $y_M=\dfrac{y_1+y_2}{2}$. Print the two coordinates in order, each with exactly 3 decimal places.

Input

The only line contains real numbers $x_1$, $y_1$, $x_2$, $y_2$, the coordinates of $A$ and $B$.

Output

Print $x_M$ and $y_M$ on one line, separated by a space; each value has exactly 3 decimal places.

Subtasks

• Subtask 1 (100 points): $|x_i|,|y_i|\le10^9$.

Examples

Example 1

Input

0 0 2 4

Output

1.000 2.000

Explanation. Substituting 0, 0, 2, 4 into ((x₁+x₂)/2, (y₁+y₂)/2) gives approximately 1, 2. The required output formatting produces 1.000 2.000.

Example 2

Input

1 1 2 2

Output

1.500 1.500

Explanation. Substituting 1, 1, 2, 2 into ((x₁+x₂)/2, (y₁+y₂)/2) gives approximately 1.5, 1.5. The required output formatting produces 1.500 1.500.

Example 3

Input

-3 5 1 -1

Output

-1.000 2.000

Explanation. Substituting -3, 5, 1, -1 into ((x₁+x₂)/2, (y₁+y₂)/2) gives approximately -1, 2. The required output formatting produces -1.000 2.000.