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