#include <bits/stdc++.h>
#define fi first
#define se second
#define pb push_back
#define sz(a) (int)a.size()
#define all(a) a.begin(),a.end()
#define rep(i,n) for(int i=0;i<n;i++)
#define crep(i,x,n) for(int i=x;i<n;i++)
#define drep(i,n) for(int i=n-1;i>=0;i--)
#define vec(...) vector<__VA_ARGS__>
#define _3qplfh5 ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0)
using namespace std;
typedef long long ll;
typedef long double ld;
using pii=pair<int,int>;
using vi=vector<int>;
using vll=vector<long long>;
int main(){
_3qplfh5;
int n;
cin>>n;
vi a(n);
rep(i,n){
char ch;
cin>>ch;
a[i]=ch-'a';
}
ld ans=1e9;
pii p={-1,-1};
rep(i,n){
set<char> ch;
crep(j,i,n){
ch.insert(a[j]);
ld x=sz(ch),y=j-i+1;
if(x/y<ans){
ans=x/y;
p={i,j};
}
}
}
cout<<p.fi+1<<" "<<p.se+1<<"\n";
//
return 0;
}
