// Fasor.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include <iostream>

int main()
{
    int N, K;
    std::cin >> N >> K;
    int a;
    int max = 0;
    std::cin >> a;
    max = a;
    int hely = 1, db = 0, osszes = 1;
    int megoldas = -1;
    while (osszes < N) {
        std::cin >> a;
        osszes++;
        if (megoldas == -1) {
            if (a > max) {
                max = a;
                hely = osszes;
                db = 0;
            }
            else db++;
            if (db == K )  megoldas = hely;
        }
    }
    if (megoldas == -1 && db < K) megoldas = hely;
    std::cout << megoldas;
}