#include <bits/stdc++.h> using namespace std; int a[2001]; int main() { int n; cin>>n; for(int i=1;i<=n;i++){ cin>>a[i]; } int shu,qwz,hwz; cin>>shu; int flag=0; for(int i=1;i<=n;i++){ if(a[i]==shu && flag==0){ qwz=i; flag=1; } if(a[i]>shu){ hwz=i-1; break; } } if(flag==0){ cout<<-1<<endl; } else{ cout<<qwz<<" "<<hwz<<endl; } return 0; }