#include <iostream>

using namespace std;

int main()
{
    int n;
    int a[1000];
    cin >> n;
    for(int i = 0; i < n; ++i){
        cin >> a[i];
    }
    int w;
    cin >> w;
    int q = 0;
    cin >> q;
    int r = 0;
    cin >> r;
    for(int i = 0; i < n; ++i){
        if(a[i]==w){
            q = q + 1;
            if(q == 2){
            r = i + 1;
            }
        }
    }
            if(q == 1 || q == 0){
            cout << "No solution";
        } else {
     cout << r;
    }
}