#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using str = string;
using T = tuple<double, ll, ll>;
#define int long long
#define Base 31
#define sz(a) (int)a.size()
#define FOR(i, a, b) for ( int i = a ; i <= b ; i++ )
#define FORD(i, a, b) for ( int i = b ; i >= a ; i-- )
#define REP(i, n) for ( int i = 0 ; i < n ; ++i )
#define REPD(i, n) for ( int i = n - 1 ; ~(--i) ; )
#define all(x) x.begin() , x.end()
#define pii pair<int , int>
#define fi first
#define se second
#define Lg(x) 31 - __builtin_clz(x)
constexpr ll LINF = (1ll << 62);
constexpr int INF = (1ll << 31);
constexpr int MAX = 1e6 + 5;
constexpr int Mod = 1e9 + 7;
void setupIO( const string& PROB ){
//Phu Trong from Nguyen Tat Thanh High School for gifted student
cin.tie(nullptr)->sync_with_stdio(false); cout.tie(nullptr);
// freopen( (PROB + ".inp").c_str(), "r", stdin);
// freopen( (PROB + ".out").c_str(), "w", stdout);
cout << fixed << setprecision(10);
}
void Whisper(){
int n; string s; cin >> n >> s;
s = '$' + s;
int L = 1, R = 1;
double ans = 1000000000.00;
for ( int k = 1 ; k <= 26 ; k++ ){
int l = 1, pl = 0, pr = 0, sz = 0, len = 0;
vector<int> cnt(26 , 0);
for ( int i = 1 ; i <= n ; i++ ){
while(l < i && sz > k){
--cnt[s[l] - 'a']; if(cnt[s[l] - 'a'] == 0) sz--; l++;
}
++cnt[s[i] - 'a']; if(cnt[s[i] - 'a'] == 1) ++sz;
if (sz == k){
if (i - l + 1 > len){
len = i - l + 1;
pr = i;
pl = l;
}
}
}
double cur = (double) k / len;
if (cur < ans){
L = pl;
R = pr;
ans = cur;
}
// cout << k << " " << L << " " << R << " " << ans << '\n';
}
cout << L << " " << R << '\n';
}
signed main(){
setupIO("Whisper");
int Test = 1;
// cin >> Test;
for ( int i = 1 ; i <= Test ; i++ ){
Whisper();
if (i < Test) cout << '\n';
}
}
