/* package whatever; // don't place package name! */
import java.math.*;
import java.util.*;
import java.lang.*;
import java.io.*;
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
public static void main
(String[] args
) { Scanner i
= new Scanner
(System.
in); System.
out.
print(c.
subtract(d
));
}
}
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