#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#include <bits/stdc++.h>
using namespace std;
//#define int long long
#define ONLINE_JUDGE
#ifndef ONLINE_JUDGE
#define OPEN freopen(".in", "r", stdin); \
freopen(".out", "w", stdout);
#else
#define OPEN void(23);
#endif
void solve()
{
int n; cin >> n;
string str; cin >> str; str = '$' + str;
vector <array <int, 26>> pref(n +1);
for(int i = 0; i < 26; i++) pref[0][i] = 0;
for(int i = 1; i <= n; i++)
{
pref[i] = pref[i -1];
pref[i][str[i] - 'a' +1]++;
}
long double ans = 2;
pair <int, int> inds;
for(int l = 1; l <= n; l++)
{
for(int r = l; r <= n; r++)
{
array <int, 26> c;
int tot = 0;
for(int i = 0; i < 26; i++)
c[i] = pref[r][i] - pref[l -1][i], tot += (c[i] != 0);
long double cost = tot;
cost /= (r - l +1);
//cerr << l << " " << r << " " << cost << "\n";
if(cost < ans)
{
ans = cost;
inds = {l, r};
}
}
}
cout << inds.first << " " << inds.second << "\n";
return;
}
int32_t main()
{
OPEN;
ios_base::sync_with_stdio(false);
cin.tie(0); cout.tie(0);
int t = 1; //cin >> t;
while(t--)
{
solve();
}
}
