#include<bits/stdc++.h>
using namespace std;
#pragma GCC optimize("O3")
#define tof_io ios_base::sync_with_stdio(false);cin.tie(0) , cout.tie(0);
#define double long double
#define int long long
#define pb push_back
#define all(x) x.begin(),x.end()
#define endl '\n'
const int mod = 998244353; //998244353 1e9+7 1e9+9
const int inf = 1e18;
const int N = 1e6 + 23;
const int lg = 23;
int fac[N];
int inv[N];
int dnt_pow (int a, int b, int md = mod){int ans = 1; while(b){if(b&1){ans = (a*ans)%md;}a = (a*a)%md;b >>= 1;}return ans ;}
void dnt_bld (){fac[0] = 1; inv[0] = dnt_pow(fac[0],mod-2) ;for(int i = 1 ; i < N ; i++) {fac[i] = (fac[i-1] * i) % mod;inv[i] = dnt_pow( fac[i] , mod-2);}}
int dnt_ncr (int r,int n){if(r>n) return 0; return fac[n] * inv[r] % mod * inv[n-r] % mod;}
bool cmp (pair<int,int> a, pair<int,int> b){ return a.second > b.second; }
double mn = 1.0;
int L = -1;
int R = -1;
vector<int> cnt(26);
void check(string s , int i , int j)
{
double len = j - i + 1;
double cnt1 = 0;
for(int i = 0; i < 26; i++)
{
if(cnt[i] > 0) cnt1++;
}
double res = cnt1 / len;
if(res < mn)
{
L = i;
R = j;
mn = res;
}
}
int32_t main()
{
int n;
cin >> n;
string s;
cin >> s;
for(int i = 0; i < n; i++)
{
for(int j = 0; j < 26; j++) cnt[j] = 0;
string k="";
for(int j = i; j < n; j++)
{
k = k + s[j];
cnt[s[j]-'a']++;
check(k,i,j);
}
}
cout << L+1 << ' ' << R+1;
}
