#include<fstream>
using namespace std;
ifstream fin("secvrest.in");
ofstream fout("secvrest.out");
long long i,x,n,dr,st,ok,v[100001];
long long rest[100001],frecv[100001];
int main()
{
    fin>>n;
    ok=1;
    for(i=1;i<=n;++i)
        fin>>v[i];
    for(i=1;i<=n;++i)
    {
        x=v[i];
        rest[i]=rest[i-1]+x%n;
        rest[i]%=n;
        if(frecv[rest[i]]>0)
        {
            dr=i;
            break;
        }
        else if(rest[i]==0)
        {fout<<"1 "<<i;
        ok=0;
        break;}
        frecv[rest[i]]++;

    }
    if(ok==1)
    {
        st=1;
        while(rest[st]!=rest[dr])
            st++;
        fout<<st+1<<" "<<dr;
    }

}