#include<stdio.h>

int main(void){
	int n,a,b,d;
	char c;

	scanf("%d",&n);
	for(;n!=0;n--){
		scanf("%d %d",&a,&b);

		if(a==b)
			c=61;
		else{
			d=a-b;
			while(d!=1&&d!=-1)d/=2;
			if(d==1)
				c=62;
			else
				c=60;
		}

		printf("%c\n",c);

	}

	return 0;
}