哪裡錯了
一直WA = ="
package test;
import java.util.Scanner;
public class aaa {
public static void main(String args[])throws Exception{
Scanner cin = new Scanner(System.in);
Long m,s,y,z;
m=cin.nextLong();
if(m==0)
System.exit(0);
for(int i=0;i<m;i++)
{
s=cin.nextLong();
if(s==0)
System.exit(0);
y=cin.nextLong();
if(y==0)
System.exit(0);
z=s+y;
if(s>y){
System.out.println(">"+z);
}
else if(s<y){
System.out.println("<"+z);
}
else {
System.out.println("="+z);
}
}
}
}