import java.util.*;
import java.lang.*;
import java.io.*;
class Ideone
{
{
double xa, ya, za, xb, yb, zb;
Scanner in
= new Scanner
(System.
in);
xa = in.nextDouble();
ya = in.nextDouble();
za = in.nextDouble();
xb = in.nextDouble();
yb = in.nextDouble();
zb = in.nextDouble();
double AB
= Math.
sqrt((xb
-xa
)*(xb
-xa
)+(yb
-ya
)*(yb
-ya
)+(zb
-za
)*(zb
-za
));
}
}
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