#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ar array
int n, cnt[26];
string s;
void add(int i, int& colors) {if (++cnt[s[i]-'a']==1) ++colors;}
void sub(int i, int& colors) {if (--cnt[s[i]-'a']==0) --colors;}
ar<int, 3> ans={10000000, -1, -1};
void updAns(int k, int l, int r) {
//answer is ans[0]/(ans[2]-ans[1]+1)
//current is k/(r-l+1)
//want to update if (k)/(r-l+1)<ans[0]/(ans[2]-ans[1]+1) --> k*(ans[2]-ans[1]+1)<ans[0]*(r-l+1)
if (k*(ans[2]-ans[1]+1)<ans[0]*(r-l+1)) ans={k, l, r};
}
void solve(int k) {
memset(cnt, 0, sizeof(cnt));
int colors=0;
for (int l=0, r=0; r<n; ++r) {
add(r, colors);
while(colors>k) sub(l++, colors);
updAns(k, l, r);
}
}
int main() {
ios::sync_with_stdio(0);
cin.tie(0);
cin >> n >> s;
for (int i=1; i<=26; ++i) solve(i);
//cout << ans[0] << " " << ans[1]+1 << " " << ans[2]+1 << "\n";
cout << ans[1]+1 << " " << ans[2]+1 << "\n";
return 0;
}
