#include <bits/stdc++.h>

using namespace std;


int main(){


    int n, e; cin >> n >> e;
    vector<int> v;

    for (int i = 0; i < n; i++){
        int a; cin >> a; v.push_back(a);
    }

    int b = -1, j = -1, curr = 0;
    bool vanerossz = false;
    int maxi = 0;
    pair<int, int> maxis = {0, 0};

    while (b < n-1 && j < n-1){
        while (curr <= e && !vanerossz && j < n-1){
            j++;
            if (v[j] < 15 || v[j] > 25) curr++;
            if (v[j] < 10 || v[j] > 30) vanerossz = true;
            if (j-b > maxi && curr <= e && !vanerossz && j < n){
                maxi = j-b;
                maxis = {b, j};
            }
        }
        b++;
        if (v[b] < 15 || v[b] > 25) curr--;
        if (v[b] < 10 || v[b] > 30) vanerossz = false;
    }

    if (maxi == 0){
        cout << -1 << endl;
        return 0;
    }

    cout << maxis.first+2 << " " << maxis.second+1 << endl;



    return 0;
}