#include <bits/stdc++.h>
using namespace std;
#define int long long
#define rep(i,a,b) for(int i=a;i<=b;++i)
#define per(i,a,b) for(int i=a;i>=b;--i)
#define pii pair<int,int>
#define pb push_back
#define fi first
#define se second
const int MAXN = 2e5 + 10;
int a[MAXN];
int32_t main(){
ios::sync_with_stdio(0);cin.tie(0);
int n;
string s;cin >> n >> s;
rep(i,1,n) {
a[i] = s[i-1]-'a';
}
pii cur = {1,0}, ex;
rep(i,1,26) {
int cnt = 0;
int c[26] = {};
int l = 1;
rep(r,1,n) {
if (c[a[r]] == 0) cnt++;
c[a[r]]++;
while (cnt > i) {
if (c[a[l]] == 1) cnt--;
c[a[l++]]--;
}
//cout << cur.fi << "/" << cur.se << ' ' << i << "/" << r-l+1 << '\n';
if (cur.fi*(r-l+1) > i*cur.se) cur = {i,r-l+1}, ex = {l,r};
}
}
cout << ex.fi << ' ' << ex.se << '\n';
return 0;
}
