Problem: Write a program that reads the coordinates of the vertices of a convex n-sided polygon (a polygon whose internal angles are less than 180 degrees, that is, a polygon that is not dented) and outputs its area. The vertices are named Vertex 1, Vertex 2, Vertex 3, ... Vertex n according to the order of edge connections.

However, n is 3 or more and 20 or less. You can also use the following formula to find the area S from the lengths a, b, and c of the three sides of the triangle.

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input

The input is given in the following format:


x1, y1
x2, y2
::
xn, yn


xi and yi are real numbers that represent the x and y coordinates of vertex i, respectively.

output

Outputs the area S (real number) on one line. The output can contain an error of 0.000001 or less.

Example

Input

0.0,0.0
0.0,1.0
1.0,1.0
2.0,0.0
1.0,-1.0


Output

2.500000

Solution (in PYTHON3):

Solution:
import sys
readlines = sys.stdin.readlines
write = sys.stdout.write
def solve():
    P = []
    for line in readlines():
        x, y = map(float, line.split(","))
        P.append((x, y))
    N = len(P)
    s = 0
    for i in range(N):
        x0, y0 = P[i-1]; x1, y1 = P[i]
        s += x0*y1 - x1*y0
    write("%.16f\n" % (abs(s)/2))
solve()