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