#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; cin>>n; 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;<<endl; return 0; } cout<<i<<" "; while (a[i]==m&&i<=n) i++; cout<<i-1; return 0; }