#include <bits/stdc++.h>
using namespace std;

int main() {
	int n, k;
    cin>>n>>k;
    vector<int> f(n);
    int jó=-1;
    int max=-1;
    int db=0;
    int ok=0;
    for(int i=0; i<n; i++){
        cin>>f[i];
        if(max<f[i]&&ok==0){
            max=f[i];
            jó=i+1;
            db=0;
        }
        else if(ok==0){
            db++;
        }
        if(db==k&&ok==0){
            cout<<jó;
            ok=1;
        }
    }
    if(ok==0){
        cout<<jó;
    }
}