522

#include <iostream>
using namespace std;

int main(){
    int n, x[1005], k;
    cin  >> n >> k;
    for(int i = 1 ; i <= n ; ++ i)
        cin >> x[i];
    int p = 0, q = 0;
    for(int i = 1 ; i < n - k && !p ; ++i)
        for(int j = i + 1 ; j <= n - k + 1 && !p; j ++)
        {
            bool ok = true;
            for(int v = 0; v < k && ok ; v ++)
                if(x[i + v] != x[j + v])
                    ok = false;
            if(ok)
                p = i, q = j;
        }
    if(p)
        cout << p << " " << q;
    else
        cout << "NU";
    return 0;
}