#include<bits/stdc++.h> using namespace std; int main() { int n,a[2001],b[2001],m,i; cin>>n; for(i=1;i<=n;i++) { cin>>a[i]; } cin>>m; 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; }