#include<bits/stdc++.h> using namespace std; int main(){ int n,m; cin>>n; int a[n+1]; for(int i=1;i<=n;i++){ cin>>a[i]; } cin>>m; int f=-1; int b=1; for(int i=1;i<=n;i++){ if(a[i]==m){ f=i; cout<<f<<" "; break; } } for(int i=n;i>=1;i--){ if(a[i]==m){ b=i; cout<<b; break; } } if(f==-1){ cout<<-1; }else{ cout<<f<<" "<<b; } return 0; }