#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 a[2001]; int x,n,first=-1,last=-1; cin>>n; for(int i=1;i<=n;i++) cin>>a[i]; cin>>x; for(int i=1;i<=n;i++){ if(a[i]==x&&first==-1) first=i; if(a[i]==x) last = i; } if(first==-1) cout<<-1<<endl; else cout<<first<<" "<<last<<endl; return 0; }