#include<iostream>
#include<cstdlib>
#include<cstdio>
#include<cmath>
long a[100000];
long b[100000];
long c[100000];
int d[100000];
using namespace std;
int main(){
    int n;
    int max;
    cin>>n;
    int i;
    for (i=0; i<n; i++){
        cin>>a[i];
        d[i]=1;
    }
    for (i=0; i<n-1; i++){
        float r=1+(a[i+1]-a[i])*(a[i+1]-a[i]);
        c[i]=sqrt(r);

    }
    for (i=0; i<n-2; i++){
       if ((a[i]-a[i+1])==(a[i+1]-a[i+2])){
            c[i+1]+=c[i];
            d[i+1]=d[i]+1;
            //cout<<d[i]<<" ";
       }
    }
    max=c[0];
    int t=0;
    for (i=0; i<n-1; i++){
        if (max<c[i]) {
            max=c[i];
            t=i;
        }
    }
//    cout<<d[0]<<" "<<d[1]<<" "<<d[2]<<" "<<d[3]<<" ";
    cout<<t+2-d[t]<<" "<<t+2;
    system("pause");
}