#include<bits/stdc++.h> using namespace std; int main(){ int a[2005],n,k,qian=2005,hou=0,flag=0; cin>>n; for(int i=1;i<=n;i++){ cin>>a[i]; } cin>>k; for(int i=1;i<=n;i++){ if(a[i]==k){ flag=1; if(qian>i) qian=i; if(hou<i) hou=i; } } if(flag==0) cout<<"-1"; else cout<<qian<<" "<<hou; return 0; }