#pragma GCC optimize ("O3")
#pragma GCC target ("avx")
#include "bits/stdc++.h"

using namespace std;
using ll = long long;

const char c_le = ';'+1;
const char c_ge = '?'-1;

int N;
int main() {
    scanf("%d", &N);
    for (int i = 0; i != N; ++i){
        int a, b;
        scanf("%d%d", &a, &b);
        if (a == b){
            putchar('=');
        }
        else if ((ll)unsigned(a-b) == ll(a-b)){
            putchar(c_ge);
        }
        else
            putchar(c_le);
        putchar('\n');
    }
    return 0;
}