#include <bits/stdc++.h>
using namespace std;
#define int long long int
#define double long double
inline int power(int a, int b) {
int x = 1;
while (b) {
if (b & 1) x *= a;
a *= a;
b >>= 1;
}
return x;
}
const int M = 1000000007;
const int N = 3e5+9;
const int INF = 2e9+1;
const int LINF = 2000000000000000001;
//_ ***************************** START Below *******************************
vector<int> a;
vector<int> b;
vector<int> consistency(int n, int k) {
//* Assuming a[0] < b[0]
int i=0, j=n-1;
int maxSum = 0;
int x = -1, y = -1;
while(i<n && j>=0){
int sum = a[i] + b[j];
if(sum <= k){
if(sum>maxSum){
maxSum = sum;
x = i;
y = j;
}
i++;
}
else if(sum >= k){
j--;
}
}
return {0, 0, 0};
}
vector<int> practice(int n, int k) {
return {0, 0, 0};
}
void solve() {
int n, k;
cin >> n >> k ;
a.resize(n);
b.resize(n);
for(int i=0; i<n; i++) cin >> a[i];
for(int i=0; i<n; i++) cin >> b[i];
auto ans1 = consistency(n, k);
cout << ans1[1] << "+" << ans1[2] << "=" << ans1[0] << endl;
// auto p = practice(n, k);
// cout << "( " << ans1[1] << "+" << ans1[2] << "=" << ans1[0] << " ) -> ";
// cout << "( " << p[1] << "+" << p[2] << "=" << p[0] << " )" << endl;
}
int32_t main() {
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
int t = 1;
cin >> t;
while (t--) {
solve();
}
return 0;
}
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