#include <bits/stdc++.h>
using namespace std;
double Fib(double x, double z);
string BinDec(unsigned long long x);
string StringInt(long long x);
unsigned long long StringInt(string x);
unsigned long long BinDec(string x);
unsigned long long POWMOD(unsigned long long x, unsigned long long y,
                          unsigned long long mod);
unsigned long long POWE(long long, long long);
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int x, i, j, y, z, s = 0, c = 0, e = 0, lol = -1, lol2 = -1;
  string a, b;
  cin >> x >> a >> b;
  map<pair<char, char>, int> ans;
  for (i = 0; i < x; i++) {
    if (a[i] != b[i]) {
      ans[{a[i], b[i]}] = i + 1;
      s++;
    }
  }
  for (i = 0; i < x; i++) {
    if (a[i] != b[i]) {
      if (ans[{b[i], a[i]}] != 0 && c == 0) {
        c = 1;
        lol = i + 1;
        lol2 = ans[{b[i], a[i]}];
        break;
      }
      if (c == 0 && e == 0) {
        for (j = 0; j < 27; j++) {
          if (ans[{b[i], j + 'a'}] != 0 && c == 0) {
            e = 1;
            lol = i + 1;
            lol2 = ans[{b[i], j + 'a'}];
            break;
          }
        }
      }
    }
  }
  if (c == 1)
    s -= 2;
  else if (e == 1)
    s--;
  cout << s << endl << lol << ' ' << lol2;
  return 0;
}
double Fib(double x, double z) {
  int i = 0;
  double f = x, r = x, t;
  for (i = 2; i < z; i++) {
    t = f;
    f += r;
    r = t;
  }
  return f;
}
string BinDec(unsigned long long x) {
  string z;
  while (1) {
    z += ((x % 3) + '0');
    x /= 3;
    if (x == 0) break;
  }
  while (1) {
    if (z.size() == 30) break;
    z += '0';
  }
  reverse(z.begin(), z.end());
  return z;
}
unsigned long long BinDec(string x) {
  long long i;
  unsigned long long z = 1, a = 0;
  for (i = x.size() - 1; i >= 0; i--) {
    if (x[i] == '1') a += z;
    if (x[i] == '2') a += (2 * z);
    z *= 3;
  }
  return a;
}
unsigned long long StringInt(string x) {
  unsigned long long z = 0, i;
  for (i = 0; i < x.size(); i++) {
    z *= 2;
    z += (x[i] - '0');
  }
  return z;
}
string StringInt(long long x) {
  string z;
  while (x != 0) {
    z += (x % 10 + '0');
    x /= 10;
  }
  reverse(z.begin(), z.end());
  return z;
}
unsigned long long POWMOD(unsigned long long base, unsigned long long exp,
                          unsigned long long mod) {
  unsigned long long res = 1;
  while (exp > 0) {
    if (exp % 2 == 1) res = (res * base);
    res %= mod;
    exp /= 2;
    base = (base * base);
    base %= mod;
  }
  return res % mod;
}
unsigned long long POWE(long long base, long long exp) {
  unsigned long long res = 1;
  while (exp > 0) {
    if (exp % 2 == 1) res = (res * base);
    exp /= 2;
    base = (base * base);
  }
  return res;
}
