#include <iostream> #include <cstdio> using namespace std; int main() { int n,m,c=0,b=0; cin>>n; int a[n+1]; for (int i=1;i<=n;i++){ cin>>a[i]; } cin>>m; for (int i=1;i<=n;i++){ if (a[i]==m){ c=i; break;} } if (c==0){ cout<<-1; return 0; } for (int i=n+1;i>1;i++){ if (a[i]==m){ b=i; break; } } cout<<c<<' '<<b; return 0; }