#include <iostream>
#include <fstream>
using namespace std;
ifstream f("subsecv.in");
ofstream g("subsecv.out");
int v[10002];
int main()
{   int n,x,st=999999,dr=999999,val,y;
  long long s=0;
  f>>n>>x;
  s=x;
  s%=n;
  v[s%n]=1;
  for(int i=2; i<=n; i++)
  {
      f>>x;
      s+=x;
      s%=n;
      if(s%n==0)
          {
              g<<1<<" "<<i;
          return 0;
          }
          if(!v[s%n])
            v[s%n]=i;
      else
      { if(v[s%n]<st)
          st=v[s%n],dr=i,val=s%n;
            else
                if(v[s%n]==st && i<dr)
                    st=v[s%n],dr=i,val=s%n;






      }
  }
  g<<st+1<<" "<<dr;




    return 0;
}