#include<bits/stdc++.h> using namespace std; int main() { int n,a[2001],m; cin>>n; for(int i=1;i<=n;i++){ cin>>a[i]; } cin>>m; int i=1; while(a[i]!=m && i<=n) i++; if(i==n+1){ cout<<-1<<endl; return 0; } cout<<i<<" "; while(a[i]==m && i<=n) i++; cout<<i-1<<endl; return 0; }