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