This problem is very simple problem. We define J(n,k) like this: 1. J(n,1)=n 2. J(n,k)=$n^{J(n,k-1)}$ (k=2,3,…) We call this number “Jacana Number”. In this problem you are given two jacana numbers and you must output which Jacana Number is greater than the other.
输入解释
The first line contains an integer T (1 <= T <= 10000), the number of test cases. Each test case contains four integers n, a, m, b (1 <= n, a, m, b <= $10^9$)
输出解释
For each test case output one of (‘>’, ‘=’, ‘<’) in one line. If J(n,a)> J(m,b), output ‘>’. If J(n,a)= J(m,b), output ‘=’. If J(n,a)< J(m,b), output ‘<’.