# include<iostream> using namespace std; int main(){ int n,m,a[1000],nn,mm,i; bool b=0; cin>>n; for(i=1;i<=n;i++) cin>>a[i]; cin>>m; for(i=1;i<=n;i++){ if(a[i]==m) {nn=i; b=1; break;} } for(i=n;i>=1;i--){ if(a[i]==m) {mm=i; break;} } if(b==1){ cout<<nn<<" "<<mm;} else{ cout<<"-1"; } }