#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define fi first
#define se second
#define pb push_back
#define pii pair<int,int>
#define pll pair<long long,long long>
using namespace std;
int n,f[100010][30],alf='z'-'a',l,r,ini,fin,med;
string s;
pii a={-1,-1};
int cnt(int x,int y){
int ans=0;
for(int i=0; i<=alf; i++) if( f[y][i]-f[x-1][i] > 0 ) ans++;
return ans;
}
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(0);
cin >> n >> s;
for(int i=1; i<=n; i++){
for(int j=0; j<=alf; j++) f[i][j] = f[i-1][j];
f[i][ s[i-1]-'a' ]++;
}
int L,R;
for(int sz=1; sz<=alf+1; sz++){
L = R = 1;
while( R<n ){
if( cnt( L , n ) < sz ) break;
while( R+1 <= n && cnt( L , R+1 ) <= sz ) R++;
if( a.fi==-1 ) a = { sz , R-L+1 } , l = L , r = R;
if( sz*a.se < a.fi*(R-L+1) ) a = { sz , R-L+1 } , l = L , r = R;
L++;
}
}
cout << l << " " << r;
return 0;
}
