#include <bits/stdc++.h> using namespace std; int main(){ int n; cin>>n; int a[n]; for(int i=0;i<n;i++){ cin>>a[i]; } int m; cin>>m; int last_i,count_i=0; for(int i=0;i<n;i++){ if(a[i]==m){ last_i=i; count_i++; } } if(count_i==0) cout<<-1; else{ cout<<last_i-count_i+2<<' '<<last_i+1; } }