#include <fstream.h>
#include <math.h>

int main()
{
 signed long max = -1, n, y1, y2, m;
 cin>>n>>y1;
 for(long i=1; i<n; i++)
 {
  cin>>y2;
  if(labs(y2-y1)>max)
   {max = labs(y2-y1); m = i;}
  y1 = y2;
 }
 cout<<m<<' '<<(m+1)<<'\n';
 return 0;
}

subject