#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,a[2001],m,t1=0,t2=0; cin>>n; for(int i=1;i<=n;i++){ cin>>a[i]; } cin>>m; for(int i=1;i<=n;i++){ if (a[i]==m){t1=i;break;} } for(int i=n;i>=1;i--){ if(a[i]==m){t2=i;break;} } if(t1==0)cout<<-1<<endl; else cout<<t1<<" "<<t2<<endl; return 0; }