#include <bits/stdc++.h>
#define pb push_back
#define fst first
#define snd second
typedef long long ll;
typedef unsigned long long ull;

using namespace std;
typedef pair<int, int> ii;
typedef pair<int, ii> iii;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0), cout.tie(0);
    int n, k, l, r;
    cin >> n >> k >> l >> r;
    vector<int> a(n);
    for (int& i : a)
        cin >> i;
    set<ii> t = {{a[0], 0}};
    for (int i = 1; i < n; ++i) {
        auto a_j1 = t.lower_bound({a[i] - r, 0}),
            a_j2 = t.lower_bound({a[i] + l, 0});
        if (a_j1 != t.end() && abs(a[i] - a_j1->fst) >= l && abs(a[i] - a_j1->fst) <= r) {
            cout << a_j1->snd + 1 << ' ' << i + 1;
            return 0;
        } else if (a_j2 != t.end() && abs(a[i] - a_j2->fst) >= l && abs(a[i] - a_j2->fst) <= r) {
            cout << a_j2->snd + 1 << ' ' << i + 1;
            return 0;
        }
        if (i >= k)
            t.erase({a[i - k], i - k});
        t.insert({a[i], i});
    }
    cout << "-1 -1";
    return 0;
}