#include<iostream>
#include<vector>
using namespace std;
int judge(vector<int> key, vector<int> wolf, int length) {
    int error_count = 0;     //假话数
    int wolf_count = 0;      //说假话的狼人数
    for (int i = 0; i < length; i++) {
        if (wolf[abs(key[i]) - 1] * key[i] < 0) {   //异号为负，说明说谎
            if (wolf[i] == -1)
                wolf_count++;
            error_count++;
        }
    }
    if (error_count == 2 && wolf_count == 1)   //2个人说谎，且其中有一个是狼人
        return 1;
    return 0;
}
int main() {
    vector<int> key;
    int n, t;
    cin >> n;
    key.resize(n);
    for (int i = 0; i < n; i++)
        cin >> key[i];
    for (int i = 0; i < n; i++) {
        for (int j = i + 1; j < n; j++) {
            vector<int> wolf(n, 1);
            wolf[i] = wolf[j] = -1;
            if (judge(key, wolf, n)) {
                cout << i + 1 << " " << j + 1 << endl;  //找到狼人，输出，结束程序
                return 0;
            }
        }
    }
    cout << "No Solution";
    return 0;
}