#define _CRT_SECURE_NO_WARNINGS
#define _SILENCE_CXX17_C_HEADER_DEPRECATION_WARNING
#include <bits/stdc++.h>
using namespace std;
const int N = 2e5 + 50;
int a[N];
int main()
{
    int n, z;
    scanf("%d%d", &n, &z);
    for (int i = 0; i < n; i++) scanf("%d", a + i);
    //sort(a, a + n);
    multiset<int> S(a, a + n);
    int cnt = 0;
    while (S.size() > 1)
    {
        auto ft = S.begin();
        auto lb = S.lower_bound(*ft + z);
        if (lb != S.end())
        {
            printf("** %d %d\n", *ft, *lb);
            cnt++;
            S.erase(lb);
            S.erase(ft);
        }
        else
            break;
    }
    printf("%d", cnt);
    return 0;
}