Driver Code
a1 = 1 NEW_LINE b1 = 2 NEW_LINE c1 = - 1 NEW_LINE d1 = 1 NEW_LINE a2 = 3 NEW_LINE b2 = 6 NEW_LINE c2 = - 3 NEW_LINE d2 = - 4 NEW_LINE distance ( a1 , b1 , c1 , d1 , a2 , b2 , c2 , d2 ) NEW_LINE