#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define ll long long
#define fr(j, l,n) for(int j = l; j < int(n); j++)
#define fn(j,n,l) for(int j=n-1;j>=l;j--)
#define gets(s) string s; cin>>s;
#define all(v) v.begin(),v.end()
#define getv(v,n) vector<ll> v(n); fr(i,0,n) cin >> v[i];
#define seev(a) for(auto x:a){cout<<x<<" ";}cout<<endl;
#define vl vector<ll>
#define ve vector
#define vvl vector<vector<ll>>
#define vp vector<pair<ll,ll>>
#define vc vector<char>
#define vvc vector<vector<char>>
#define pb push_back
#define mp make_pair
#define mse multiset<ll>
#define se set<ll>
#define ma map<ll,ll>
#define getmat(v,n,m) vector<vl>v(n,vl(m));fr(i,0,n) {fr (j,0,m) cin>>v[i][j];}
#define seemat(mat) for(auto row:mat){seev(row);}
#define YES cout<<"Yes\n";
#define NO cout<<"No\n";
using namespace std;
using namespace __gnu_pbds;
// Define ordered multiset with long long
typedef tree<long long, long long, less<long>, rb_tree_tag, tree_order_statistics_node_update> ordered_multimap;
typedef tree<ll, null_type, less<ll>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;
vl sieve;
void SieveOfEratosthenes(int n)
{
// Create a boolean array "prime[0..n]" and initialize
// all entries it as true. A value in prime[i] will
// finally be false if i is Not a prime, else true.
vl prime(n+1,true);
for (int p = 2; p * p <= n; p++) {
// If prime[p] is not changed, then it is a prime
if (prime[p] == true) {
// Update all multiples of p greater than or
// equal to the square of it numbers which are
// multiple of p and are less than p^2 are
// already been marked.
for (int i = p * p; i <= n; i += p)
prime[i] = false;
}
}
// Print all prime numbers
for (int p = 2; p <= n; p++)
if (prime[p])
sieve.push_back(p);
}
bool sortbysec(const pair<ll, ll>& a,
const pair<ll, ll>& b)
{
return (a.second < b.second);
}
// gives gcd and the other coefficients
ll gcd(ll a, ll b, ll& x, ll& y) {
if (b == 0) {
x = 1;
y = 0;
return a;
}
ll x1, y1;
ll d = gcd(b, a % b, x1, y1);
x = y1;
y = x1 - y1 * (a / b);
return d;
}
// a raised to power b
ll pwr(ll a, ll b, ll mod = 0){
ll result = 1;
if(mod == 0){
while(b){
if(b & 1) result *= a;
a *= a;
b = b >> 1;
}
}
else {
while(b){
if(b & 1){
result *= a;
result = result % mod;
}
a *= a;
a = a % mod;
b = b >> 1;
}
}
return result;
}
ll modularinverse(ll a,ll p)// p is prime
{
return pwr(a,p-2,p);
}
// to convert string to binary(63 bits)
string tobin(ll a)
{
string s;
for (int i = 0; i < 63; i++)
{
if(a%2==1)
{
s+='1';
}
else
{
s+='0';
}
a>>=1;
}
return s;
}
int log2_floor(unsigned long long i) {
return i ? 63 - __builtin_clzll(i) : -1;
// -1 as log undefined for 0
}
// QUESTION DHANG SE PADHNA
void solve(ll tc){
ll n=0,m=0,k=0,a=0,b=0,c=0,x=0,y=0,z=0;
cin>>k;
gets(s);
gets(t);
if(s==t)
{
// cout<<'1'<<endl;
YES;
return;
}
n=s.size();
m=t.size();
if(abs(n-m)>1)
{
NO;
return;
}
if(s.size()==t.size())
{
for (int i = 0; i < s.size(); i++)
{
if(s[i]!=t[i])
{
a++;
}
}
if(a<=1)
{
// cout<<'w'<<endl;
YES;
return;
}
NO;
return;
}
if(n<m)
{
swap(s,t);
swap(n,m);
// cout<<n<<' '<<m<<endl;
// cout<<s<<' '<<t<<endl;
}
if(n>m)
{
c=m;
for (int i = 0; i < m; i++)
{
if(s[i]!=t[i])
{
c=i;
break;
}
}
if(c==m)
{
YES;
return;
}
a=0;
// cout<<c<<endl;
for (int j = c; j<m; j++)
{
if(s[j+1]!=t[j])
{
NO;
return;
}
}
YES;
}
}
int main(){
#ifndef ONLINE_JUDGE
freopen("input.txt","r",stdin);
freopen("output.txt","w",stdout);
#endif
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
int t=1;
// cin>>t;
ll tc=0;
while(t--){
tc++;
solve(tc);
}
return 0;
}