#include <bits/stdc++.h>   using namespace std;   const int inf = 0x3f3f3f3f;   const double eps = 1e-6;   const int mod = 1000000007;   inline string getstr(string &s, int l, int r) {     string ret =   ;     for (int i = l; i <= r; i++) ret.push_back(s[i]);     return ret;   }   int modpow(int x, int y, int md = mod) {     if (y == 0) return 1;     int ret = modpow(x, y >> 1, md);     ret = (long long)ret * ret % md;     if (y & 1) ret = (long long)ret * x % md;     return ret;   }   string s, t;   int n;   int main() {     cin >> n >> s >> t;     int l, r;     for (l = 0;; l++) {       if (s[l] != t[l]) {         break;       }     }     for (r = n - 1;; r--) {       if (s[r] != t[r]) {         break;       }     }     int lft = 1, rgt = 1;     for (int i = l; i < r; i++) {       if (s[i] != t[i + 1]) lft = 0;       if (s[i + 1] != t[i]) rgt = 0;     }     cout << lft + rgt << endl;     return 0;   }   