#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ int n; int a[2001]; int m,t1=0,t2=0; cin>>n; for(int i=1;i<=n;i++){ cin>>a[i]; } cin>>m; int i=1; for(i=;i<=n;i++){ if(a[i]==m){ t1=i; break; } } for(i=;i<=1;i--){ if(a[i]==m){ t2=i; break; } } if(t1==0) cout<<-1<<endl; else{ cout<<t1<<" "<<t2<<endl; } return 0; }