# include<iostream> using namespace std; int n=0,m=0,a[2005],b[2005],c=0; int main(){ cin>>n; for(int i=1;i<=n;i++){ cin>>a[i]; } cin>>m; int x=1; for(int i=1;i<=n;i++){ if(a[i]==m){ b[x]=i; x+=1; c+=1; } } if(c==0)cout<<"-1"<<endl; else cout<<b[1]<<" "<<b[x-1]; return 0; }