#include<bits/stdc++.h> using namespace std; int main() { int n; cin>>n; int a[n]; for(int i=0;i<=n-1;i++){ cin>>a[i]; } int b; cin>>b; int c=-1; for(int i=0;i<=n-1;i++){ if(a[i]==b){ c=i; cout<<c+1<<" "; break; }; } for(int i=n-1;i>=0;i--){ if(a[i]==b){ c=i; cout<<c+1<<" "; break; }; } if(c==-1){ cout<<-1; } }