abc 221B

#include<iostream>

using namespace std;

int main()
{
    string s, t;
    cin >> s >> t;

    int cnt = 0;
    for(int i = 0; i < s.length(); i++)
    {
        if(i + 1 != s.length())
        {
            if(s[i] != t[i] && s[i+1] != t[i+1])
            {
                if(s[i] == t[i+1] && s[i+1] == t[i]) cnt++;
                else
                {
                    printf("No\n");
                    return 0;
                }
            }
        }
    }
    bool somannai = false;
    for(int i = 0; i < s.length(); i++)
    {
        if(s[i] != t[i])
        {
            somannai = true;
            break;
        }
    }
    if(!somannai) printf("Yes\n");
    else if(cnt == 1) printf("Yes\n");
    else printf("No\n");
}