I

#include <iostream>
#include<valarray>
#include<stdio.h>
using namespace std;
#define ll long long
#define pb push_back

int main()
{
    int n, k;
    cin >> n >> k;
    ll a[n + 1] = { 0 };
    for (int i = 1; i <= n; i++)
        cin >> a[i];

    ll sum[n + 1] = { 0 };
    for (int i = 1; i <= n; i++)
        sum[i] = a[i] + sum[i - 1];

    ll dp[n - k] = { 0 };
    for (int i = 1; i <= n - k + 1; i++)
        dp[i] = sum[i + k - 1] - sum[i - 1];

    ll x = 0, mx = 0;
    int l = 0, r = 0, y = 0;
    for (int i = n - 2 * k + 1; i >= 1; i--)
    {
        if (x <= dp[i + k])
        {
            x = dp[i + k];
            y = i + k;
        }
        if (x + dp[i] >= mx)
        {
            mx = x + dp[i];
            l = i;
            r = y;
        }
    }

    cout << l << " " << r << endl;

}